tag:blogger.com,1999:blog-85125587340703849402024-03-20T20:09:45.876-07:00PTFE MachineryPTFE Machineryhttp://www.blogger.com/profile/11221386967155866041noreply@blogger.comBlogger246125tag:blogger.com,1999:blog-8512558734070384940.post-84958601240287607612018-07-20T00:49:00.001-07:002018-07-20T00:49:10.869-07:00When to Use PEEK, PTFE or Nylon Backup Rings<div align="left" class="MsoNormal" style="background: white;">
<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 13.5pt;">Backup rings, also known as anti-extrusion rings of BURs, do exactly what their name implies: they act as back up support to sealing assemblies.</span><span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;"><o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">There are several different materials used to make backup rings, including both polymers and elastomers. The most common polymers for backup rings are PEEK, Nylon, and <a href="http://www.ptfe-machinery.com/">PTFE</a>.<b> </b>Deciding which material to use is typically based on pressure and temperature requirements.<o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">In this blog post, we will review the purpose and applications of backup rings, then discuss the ranges of pressure and temperature that PEEK, Nylon, and PTFE are suited for.<br /><span style="color: #616e7f;"><br /></span></span><span lang="EN-US" style="font-family: "arial" , sans-serif; font-size: 13pt;">Purpose of Backup Rings</span><b><span lang="EN-US" style="color: #6e8698; font-family: "arial" , "sans-serif"; font-size: 13pt;"><o:p></o:p></span></b></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">A properly designed backup ring placed between the o-ring and the clearance gap can prevent the o-ring seal from extruding into the gap while providing both support and protection to the o-ring. They work well in situations where there is a large extrusion gap, high temperatures, or high pressures.<br /><span style="color: #616e7f;"><br /></span><b>Backup rings are are commonly used in:</b><o:p></o:p></span></div>
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<li class="MsoNormal" style="background: white; mso-list: l0 level1 lfo1; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto; mso-pagination: widow-orphan; tab-stops: list 36.0pt; text-align: left;"><span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">valves for hydraulic circuits<o:p></o:p></span></li>
<li class="MsoNormal" style="background: white; mso-list: l0 level1 lfo1; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto; mso-pagination: widow-orphan; tab-stops: list 36.0pt; text-align: left;"><span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">chemical pumps<o:p></o:p></span></li>
<li class="MsoNormal" style="background: white; mso-list: l0 level1 lfo1; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto; mso-pagination: widow-orphan; tab-stops: list 36.0pt; text-align: left;"><span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">injection molding machines<o:p></o:p></span></li>
<li class="MsoNormal" style="background: white; mso-list: l0 level1 lfo1; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto; mso-pagination: widow-orphan; tab-stops: list 36.0pt; text-align: left;"><span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">adhesive dispensing valves<o:p></o:p></span></li>
<li class="MsoNormal" style="background: white; mso-list: l0 level1 lfo1; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto; mso-pagination: widow-orphan; tab-stops: list 36.0pt; text-align: left;"><span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">presses<o:p></o:p></span></li>
<li class="MsoNormal" style="background: white; mso-list: l0 level1 lfo1; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto; mso-pagination: widow-orphan; tab-stops: list 36.0pt; text-align: left;"><span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">machine tools<o:p></o:p></span></li>
<li class="MsoNormal" style="background: white; mso-list: l0 level1 lfo1; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto; mso-pagination: widow-orphan; tab-stops: list 36.0pt; text-align: left;"><span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">pharmaceuticals<o:p></o:p></span></li>
<li class="MsoNormal" style="background: white; mso-list: l0 level1 lfo1; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto; mso-pagination: widow-orphan; tab-stops: list 36.0pt; text-align: left;"><span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">agricultural machines <o:p></o:p></span></li>
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<span lang="EN-US" style="font-family: "arial" , sans-serif; font-size: 13pt;">PEEK Backup Rings</span><b><span lang="EN-US" style="color: #6e8698; font-family: "arial" , "sans-serif"; font-size: 13pt;"><o:p></o:p></span></b></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">PEEK can be used at pressures up to 20,000 psi and and a maximum temperature of 500°F. This makes PEEK ideal for high pressure and high temperature applications. PEEK is also available filled for addition strength and hardness. PEEK is quite compatible with a variety of chemicals, including cleaning compounds, and has low friction.<span style="color: #616e7f;"> <o:p></o:p></span></span></div>
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<span lang="EN-US" style="font-family: "arial" , sans-serif; font-size: 13pt;">Nylon Backup Rings</span><b><span lang="EN-US" style="color: #6e8698; font-family: "arial" , "sans-serif"; font-size: 13pt;"><o:p></o:p></span></b></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-bidi-font-weight: bold; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">Nylon 6,6</span><span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;"> works well at pressures below 10,000 psi and a maximum temperature of 186°F. Nylon works well for high pressure applications but is quite limited with regard to temperature. Nylon 6,6 filled with Molybdenum Disulfide (MoS2) to reduce friction is commonly used for backup rings. One of the drawbacks of Nylon 6,6 is its water absorption, which can range from 0.5% to 1.4% per 24 hours<span style="color: #616e7f;">.<o:p></o:p></span></span></div>
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<span lang="EN-US" style="font-family: "arial" , sans-serif; font-size: 13pt;">PTFE Backup Rings</span><b><span lang="EN-US" style="color: #6e8698; font-family: "arial" , "sans-serif"; font-size: 13pt;"><o:p></o:p></span></b></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-bidi-font-weight: bold; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">Filled <a href="http://www.ptfe-machinery.com/">PTFE</a> (glass filled, carbon filled, graphite filled, bronze filled)</span><span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;"> works with pressures up to 5,800 psi, however virgin PTFE is limited to about 3,600 psi. Virgin PTFE, therefore, is limited to low and medium pressure applications while filled PTFE works for many medium to high pressure applications. The maximum operating temperature for PTFE is around 575°F, which makes it ideal for low pressure, high temperature applications. PTFE is very chemically resistant and has extremely low friction.<o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "arial" , sans-serif; font-size: 13pt;">Conclusion</span><b><span lang="EN-US" style="color: #6e8698; font-family: "arial" , "sans-serif"; font-size: 13pt;"><o:p></o:p></span></b></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;">When it comes to backup rings, <a href="http://www.ptfe-machinery.com/">PTFE</a> works well for low to medium pressure applications but can also handle high temperatures. Nylon can handle medium to high pressure applications but is limited by operating temperature and water absorption. When it comes to backup ring materials, PEEK is can handle the highest pressures and fairly high temperatures. Keep in mind that PEEK and PTFE are comparable when it comes to low friction and chemical compatibility, both of which are important in sealing applications</span><br />
<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;">Tags:teflon ptfe,peek,nylon,back up rings</span>PTFE Machineryhttp://www.blogger.com/profile/11221386967155866041noreply@blogger.com1tag:blogger.com,1999:blog-8512558734070384940.post-12300597197163586772018-07-09T01:21:00.000-07:002018-07-09T01:21:53.903-07:00PTFE and UHMW Choice for Non-stick Bearings and Bushings in Food & Dairy Industry<br />
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<strong><span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 16pt; font-weight: normal;">Food & Dairy Bearings and Bushings:</span></strong><span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 16pt;"><o:p></o:p></span></h1>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;">Bearings and bushings can be found in almost every step in<span style="font-family: "arial" , sans-serif;"> <i>food or dairy processing industries</i></span><i>. <span style="font-family: "arial" , sans-serif;">Polymers</span></i><em><span style="font-family: "arial" , "sans-serif";"> </span></em>are a popular choice for <span style="font-family: "arial" , sans-serif;">bearings and bushings</span> in the food and dairy industry, both at the design stage and when retrofitting. Because they are greaseless, the can provide a more sanitary environment for food processing. They don’t require the maintenance that metal bearings and bushings require, thus reducing downtime for maintenance. Their durability results in longer mean times to failure. They are usually much more resistant to corrosion and much <span style="font-family: "arial" , sans-serif;">less chemically reactive than metal bearings and bushings</span><b>.</b> They also weight much less than equivalent metal bearings and bushings.<o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 16pt;">Non-stick Applications<o:p></o:p></span></h1>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;">These are all good reasons to use polymer bearings in the food and dairy industries, but what about situations where one of the design requirements is </span><span lang="EN-US"><span style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;">non-stick bearings</span></span><span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;">? That is not a problem at all. There are, in fact, two specific plastics that are commonly used in these situations: <span style="font-family: "arial" , sans-serif;"><b> </b><a href="http://www.ptfe-machinery.com/">PTFE</a> and UHMW PE.</span><o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 16pt;">PTFE<o:p></o:p></span></h1>
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<span lang="EN-US" style="font-family: "arial" , sans-serif; font-size: 10.5pt;">PTFE, or Teflon</span><b style="mso-bidi-font-weight: normal;"><span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;">,</span></b><span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;"> is well known for its anti-stick properties due to its use as a coating for cooking utensils. In fact, even <span style="font-family: "arial" , sans-serif;">Geckos can’t hang on to <a href="http://www.ptfe-machinery.com/">PTFE</a></span><b style="mso-bidi-font-weight: normal;">.</b> PTFE is also hydrophobic. It is usually known among engineers for having the lowest coefficient of friction any polymer or metal in existence. It is also the least chemically reactive polymer, and has excellent wear properties. It absorbs a minimal amount of moisture. PTFE, in its virgin form, is odorless and tasteless. It has FDA approval.<o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 16pt;">UMHW PE<o:p></o:p></span></h1>
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<strong><span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;">UMHW </span></strong><span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;">(ultra-high molecular weight) <span style="font-family: "arial" , sans-serif;">PE</span> (polyethylene) is known for its toughness, including the highest impact strength of any polymer currently available. It has no moisture absorption. Its coefficient is low enough to be comparable to <a href="http://www.ptfe-machinery.com/">PTFE</a>. More importantly, like Teflon, it provides a non-stick surface. It is often chosen because of its ability to resist material hang-up. Among its other properties is an abrasion resistance that is 10x that of carbon steel. <span style="font-family: "arial" , sans-serif;">UMHW PE</span> is tasteless, odorless, and nontoxic. It has been approved by the FDA, USDA, Canada AG and 3A dairy.<o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 16pt;">Conclusion<o:p></o:p></span></h1>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;">If you are designing equipment for the food and dairy industry, or looking to retrofit existing equipment, and require non-stick bearings or bushings, look no further than <span style="font-family: "arial" , sans-serif;"><a href="http://www.ptfe-machinery.com/">PTFE</a> and UHMW PE.</span><o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;"><span style="font-family: "arial" , sans-serif;">Tags:teflon ptfe,UHMW,food industry</span></span><br />
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PTFE Machineryhttp://www.blogger.com/profile/11221386967155866041noreply@blogger.com0tag:blogger.com,1999:blog-8512558734070384940.post-33880201557967555652018-07-04T01:28:00.000-07:002018-07-04T01:28:07.163-07:005 Applications for PEEK in the Medical Device Industry<div class="MsoNormal">
<span lang="EN-US" style="background: white; font-family: "arial" , "sans-serif";">There are millions of medical devices that include components made from PEEK. This usage has grown tremendously in the past fifteen years and is still evolving. In this post, we are going to look at typical </span><span lang="EN-US">applications for <a href="http://www.ptfe-machinery.com/">PEEK</a> in the medical device industry</span><span lang="EN-US" style="background: white; font-family: "arial" , "sans-serif";">, including both implantable devices and non-implantable devices.<o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 13pt;">#1 PEEK in Spinal Applications<span style="color: #6e8698;"><o:p></o:p></span></span></h2>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;">A stiffness comparable to that of human bone, <strong><span style="font-weight: normal;">radiolucent</span></strong><b> </b>properties, and reduced stress shielding are just a few of the features that make PEEK an excellent choice for spinal applications.<o:p></o:p></span></div>
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<strong><span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;">Spinal applications of PEEK include:</span></strong><span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;"><o:p></o:p></span></div>
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<li class="MsoNormal" style="background: white; mso-list: l0 level1 lfo1; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto; mso-pagination: widow-orphan; tab-stops: list 36.0pt; text-align: left;"><span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt;">minimally invasive spinal implants<o:p></o:p></span></li>
<li class="MsoNormal" style="background: white; mso-list: l0 level1 lfo1; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto; mso-pagination: widow-orphan; tab-stops: list 36.0pt; text-align: left;"><span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt;">disc arthroplasty,<o:p></o:p></span></li>
<li class="MsoNormal" style="background: white; mso-list: l0 level1 lfo1; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto; mso-pagination: widow-orphan; tab-stops: list 36.0pt; text-align: left;"><span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt;">anterior cervical plates,<o:p></o:p></span></li>
<li class="MsoNormal" style="background: white; mso-list: l0 level1 lfo1; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto; mso-pagination: widow-orphan; tab-stops: list 36.0pt; text-align: left;"><span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt;">dynamic stabilization and motion preservation<o:p></o:p></span></li>
<li class="MsoNormal" style="background: white; mso-list: l0 level1 lfo1; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto; mso-pagination: widow-orphan; tab-stops: list 36.0pt; text-align: left;"><span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt;">interspinous spaces<o:p></o:p></span></li>
<li class="MsoNormal" style="background: white; mso-list: l0 level1 lfo1; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto; mso-pagination: widow-orphan; tab-stops: list 36.0pt; text-align: left;"><span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt;">posterior spine stabilization rods<o:p></o:p></span></li>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 13pt;">#2 PEEK in Orthopedic Applications<span style="color: #6e8698;"><o:p></o:p></span></span></h2>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;">Arthroplasty and arthroscopy have made extensive use of PEEK for several years, including knee and shoulder arthroscopy along with knee and hip arthroplasty. The implementation of PEEK in hip cups has been especially useful. PEEK works very well for knotless suture anchors in shoulder arthroscopy. Tibial screw anchors and sheaths made of PEEK provide excellent strength and far less failure.<o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;">Benefits of PEEK for orthopedic applications include:<o:p></o:p></span></div>
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<li class="MsoNormal" style="background: white; mso-list: l2 level1 lfo2; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto; mso-pagination: widow-orphan; tab-stops: list 36.0pt; text-align: left;"><span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt;">improved stability<o:p></o:p></span></li>
<li class="MsoNormal" style="background: white; mso-list: l2 level1 lfo2; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto; mso-pagination: widow-orphan; tab-stops: list 36.0pt; text-align: left;"><span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt;">significantly better wear performance<o:p></o:p></span></li>
<li class="MsoNormal" style="background: white; mso-list: l2 level1 lfo2; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto; mso-pagination: widow-orphan; tab-stops: list 36.0pt; text-align: left;"><span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt;">and less need for revision<o:p></o:p></span></li>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 13pt;">#3 PEEK in Trauma Applications<span style="color: #6e8698;"><o:p></o:p></span></span></h2>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;">PEEK is also used in bone trauma applications such as fracture fixation plates and intramedullary (fracture fixation) nails.<o:p></o:p></span></div>
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<strong><span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;">The usage of PEEK in trauma applications results in outcomes such as:</span></strong><span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;"><o:p></o:p></span></div>
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<li class="MsoNormal" style="background: white; mso-list: l1 level1 lfo3; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto; mso-pagination: widow-orphan; tab-stops: list 36.0pt; text-align: left;"><span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt;">better pain relief<o:p></o:p></span></li>
<li class="MsoNormal" style="background: white; mso-list: l1 level1 lfo3; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto; mso-pagination: widow-orphan; tab-stops: list 36.0pt; text-align: left;"><span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt;">more straightforward MRI and CT imaging when compared to their metal counterparts<o:p></o:p></span></li>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 13pt;">#4 PEEK in Dental Applications<span style="color: #6e8698;"><o:p></o:p></span></span></h2>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;">PEEK is also used in precision, customized dentures and prosthetics that are an alternative to traditional metal dentures. They have been found to be far more comfortable, easier to tailor to a patient’s needs and an excellent fit for the modern <strong><span style="font-weight: normal;">CAM/CAD approach to dental prosthetics</span></strong><b>.</b><o:p></o:p></span></div>
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<strong><span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 13pt;">#5 PEEK in Non-Implantable Devices</span></strong><span lang="EN-US" style="color: #6e8698; font-family: "arial" , "sans-serif"; font-size: 13pt;"><o:p></o:p></span></h2>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;">Not all PEEK applications in the medical industry are for implantable devices. PEEK can be found in pumps, pistons, fluid transfer applications, and valves. PEEK seals and bearings are well established for use in critical medical and pharmaceutical applications such as dialysis, equipment, blood pumps, infusion pumps, reusable medical instruments, medical device fixtures, or tissue cutting tools. <span style="color: #616e7f;"> <o:p></o:p></span></span></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 13pt;">Why PEEK<span style="color: #6e8698;"><o:p></o:p></span></span></h2>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;">In applications such as this, PEEK medical devices offer superior fatigue properties and low moisture absorption, which is critical in implantable devices. <a href="http://www.ptfe-machinery.com/">PEEK</a> components are also more compatible with diagnostic imaging with no artifacts. Some grades of PEEK are radiolucent. Through fiber reinforcement, mechanical properties such as stiffness can be customized to meet application needs.It is possible to achieve a stiffness that approximates human bone using PEEK. Biocompatibility and biostability of load-bearing medical implants is another critical area in which PEEK excels. PEEK can also be manufactured using many different methods.<span style="color: #616e7f;"><o:p></o:p></span></span></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 13pt;">Conclusion<span style="color: #6e8698;"><o:p></o:p></span></span></h2>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;">PEEK is used in many different areas of the medical industry, from implantable devices that have to be both strong and biocompatible to reusable medical instruments that have to be sterilized repeatedly using harsh processes such as autoclaving.<a href="http://www.ptfe-machinery.com/"> PEEK</a> is an good choice for medical applications for numerous reasons, including its excellent fatigue/wear properties, high strength-to-weight ratio, and biocompatibility.</span><br />
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;">Tags:peek,applications,<span style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; color: #333333;"> polyetheretherketone</span></span><span style="color: #616e7f;"><o:p></o:p></span><br />
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PTFE Machineryhttp://www.blogger.com/profile/11221386967155866041noreply@blogger.com0tag:blogger.com,1999:blog-8512558734070384940.post-66024366862076940132018-07-02T23:37:00.000-07:002018-07-02T23:38:21.330-07:00PTFE ELECTRICAL TAPE<div align="left" class="MsoNormal" style="background: white; margin-bottom: 7.5pt;">
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<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhh42KbUuYLGNaJ2C7gNoDg7eD5AsjyiH-Eb28SKCVAVaoSExmcyxG4dGBVu3XJOSmwa3CZSwybJzfZaDnfbYXS6llvZ53NZSY6yTVlZcJQb-QruyF7F-Ts7plkwrbTG6UTzRYxFM5Xw_jM/s1600/20180225114015.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="580" data-original-width="882" height="210" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhh42KbUuYLGNaJ2C7gNoDg7eD5AsjyiH-Eb28SKCVAVaoSExmcyxG4dGBVu3XJOSmwa3CZSwybJzfZaDnfbYXS6llvZ53NZSY6yTVlZcJQb-QruyF7F-Ts7plkwrbTG6UTzRYxFM5Xw_jM/s320/20180225114015.jpg" width="320" /></a></div>
<span lang="EN-US" style="color: #9a9a9a; font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;"><br /></span>
<span lang="EN-US" style="color: #9a9a9a; font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">The base material was made via
fiberglass impregnation in PTFE and refined, coating with silicone adhesive and
with excellent heat resistant and mechanical strength.<br />
Good release and smooth<br />
Good performance of high temperature keeping, stable size.<br />
Small friction coefficient, good insulation.<br />
Good corrosion resistance.<o:p></o:p></span></div>
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<span lang="EN-US" style="color: #9a9a9a; font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">Applications<br />
1. According to different thickness, can be using as many kinds of drying
machine conveyor, bonding tape, sealing tape.<br />
2. Using for welding cloth for plastic products welding, backing mat for
plastic, film, hot sealing<br />
3. Electrical insulation, mat, gasket, and so one.<br />
4. Heat cladding layer, pack of heat insulation body.<br />
5. Microwave mat,, oven chips, food drying.<br />
6. Adhesive tape, hot transfer printing table cloths, and so on.<br />
7. Backing cloth for pressure sensitive ahdesive.<br />
8. Architectural membrance, many place of canopy, etc.<br />
9. For various petrochemical pipeline corrosion resistant cladding, power plant
emissions, environmental desulfurization.<br />
10. A flexible compensator, the friction material, wheel slice.<br />
11. After special processing, making "anti-static cloth.<o:p></o:p></span></div>
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Material: PTFEE ; Color: Brown ; Surface friction coefficient: 0.05~0.1 ;
Insulating coefficient: >=1012 ohm ; Adhesion strength (to metal):
28N/100mm ; Tensile strength: 1700N/100mm ; Temperature resistance: -70-300°<o:p></o:p></span></div>
<b><span lang="EN-US" style="color: #9a9a9a; font-family: "arial" , "sans-serif"; font-size: 10.5pt;">Tags: </span></b><span lang="EN-US" style="color: #9a9a9a; font-family: "arial" , "sans-serif"; font-size: 10.5pt;"><span style="color: #9a9a9a; text-decoration: none;"><a href="https://www.sukoptfe.com/news?tag=PTFE%20Electrical%20Tape" title="PTFE Electrical Tape">PTFE Electrical Tape</a>,</span><a href="https://www.sukoptfe.com/news?tag=PTFE%20Tape" title="PTFE Tape"><span style="color: #9a9a9a; text-decoration: none;">PTFE Tape</span></a></span>PTFE Machineryhttp://www.blogger.com/profile/11221386967155866041noreply@blogger.com0tag:blogger.com,1999:blog-8512558734070384940.post-44058292006910782102018-07-01T23:56:00.000-07:002018-07-01T23:56:48.071-07:00Beginner’s Guide to PTFE and PEEK Backup Rings<div class="MsoNormal">
<span lang="EN-US" style="background: white; font-family: "arial" , "sans-serif"; font-size: 15pt;">Backup rings can be made from a variety of materials, including polymers. In this article, we will look at <strong>PTFE and PEEK backup rings</strong>while at the same time reviewing some of the basics of backup rings.<o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 13pt;">Why Use Backup Rings?<span style="color: #6e8698;"><o:p></o:p></span></span></h2>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;">Rubber o-rings are good, but when temperatures and pressures rise they have a bad habit of extruding into clearance between mating surfaces, which isn’t a good thing. In fact, extrusion failure is one of the main causes of o-ring failure. As the o-ring begins to extrude into the clearance gap, it will experience more and more damage until it is useless. This phenomenon is sometimes called nibbling, and when it occurs you will notice that the o-ring will have a ragged edge on the low-pressure side.<o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "arial" , sans-serif; font-size: 10.5pt;">Backup rings, also known as anti-extrusion rings</span><span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;">, are used to keep o-rings from extruding into areas where they don’t belong. They are also used in conjunction with seals to either prevent damage to the seal or to control extrusion. Backup rings are made of an extrusion resistant, hard material. They fit between the o-ring (or seal) and the extrusion gap.<o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 13pt;">Where Should Backup Rings Be Used?<o:p></o:p></span></h2>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;">Backup rings are suggested for o-ring failures such as extrusion/nibbling (as we already discussed) and spiral failure<b> </b>(where cuts or splits spiral around the circumference of the o-ring). They should be used when temperatures or pressures are expected to reach a level that would cause the seal or o-ring to extrude. This could be continuous operating conditions or, as is quite common, pressure or<br />temperature spikes. Backup rings are also used when the design requires a large extrusion gap.<o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;">Note that when used with seals, backup rings are usually placed downstream of the seal gland.<o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;">Finally, backup rings can be used in both static and dynamic applications.<span style="color: #616e7f;"><o:p></o:p></span></span></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 13pt;">What Kinds of Materials Are Used for Backup Rings?<o:p></o:p></span></h2>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;">Two of the most common materials used for backup rings are <a href="http://www.ptfe-machinery.com/">PTFE</a><b> </b>and <a href="http://www.ptfe-machinery.com/">PEEK</a>. Both PTFE and PEEK are far less likely to extrude than the elastomers used for seals and o-rings. This means they can retain their shape even in the presence of elevated temperatures, high pressures, and aggressive chemicals. This allows them to hold the o-ring or seal in place.<o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "arial" , sans-serif; font-size: 10.5pt;">Both PEEK backup rings and PTFE backup rings are usually filled</span><span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;">, meaning they have a filler material such as glass or carbon fiber added to increase their compressive strength and dimensional stability. Another benefit of using <a href="http://www.ptfe-machinery.com/">PEEK</a> and <a href="http://www.ptfe-machinery.com/">PTFE</a> for backup rings lies in their chemical resistivity, making them ideal for chemically aggressive environments. They also have low friction and relatively high continuous operating temperatures.<span style="color: #616e7f;"><o:p></o:p></span></span></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 13pt;">Conclusion<o:p></o:p></span></h2>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;"><a href="http://www.ptfe-machinery.com/">PTFE</a> and PEEK are popular choices for backup rings because they are dimensionally stable, chemically resistant, have excellent compressive strength, and function well even at elevated temperatures and pressures. As an anti-extrusion device, they work extremely well with both o-rings and seals to prevent extrusion in situations that involve large clearances, high temperatures, and high pressures. If you are experiencing extrusion issues, don’t forget to consider a backup ring!<o:p></o:p></span></div>
<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;">Tags:teflon ptfe,ptfe,peek,rings</span>PTFE Machineryhttp://www.blogger.com/profile/11221386967155866041noreply@blogger.com0tag:blogger.com,1999:blog-8512558734070384940.post-82252832870088571812018-06-28T01:34:00.000-07:002018-06-28T01:34:37.062-07:004 Key Benefits of PTFE Energized Seals for the Aerospace Industry<div style="background: white;">
<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 13.5pt;">PTFE energized seals have found a multitude of applications in the aerospace industry. </span><span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;"><o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 13.5pt;">There are many reasons for the use of <a href="http://www.ptfe-machinery.com/">PTFE</a> in aerospace. It offers excellent strength, extremely low friction, toughness, dimensional stability, and abrasion resistance. When combined with a spring-energizer, it provides a combination of properties and characteristics that work very well in the aerospace industry.<br /></span><span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;"><o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 13pt;">PTFE Seals and Aerospace<o:p></o:p></span></h2>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;">PTFE seals can be found in flight controls, jet engines, airframes, air management systems, and fuels systems. This includes commercial, military, and space applications. PTFE energized seals can be used in engine cooling lines, auxiliary power units, cabin pressure systems, compressor seals, turbine seals, pumps, fuel injectors, hydraulic controls, and more.<o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 13pt;">1. Low Friction<o:p></o:p></span></h2>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;">One of PTFE’s most outstanding characteristics is extremely low friction. It is self-lubricating and can be used in dry-running applications without a problem. <a href="http://www.ptfe-machinery.com/">PTFE</a> also does not exhibit problematic stick-slip<strong> </strong>behavior. These features also reduce power and torque requirements, while increasing overall efficiency. <o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 13pt;">2. Extreme Temperature Performance<o:p></o:p></span></h2>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;">Aerospace applications often involve extreme temperatures, and PTFE is made for extreme<strong> temperatures</strong>. It can handle a wide range of temperatures, with a maximum continuous operating temperature of 550°F down to cryogenic temperatures like -450°F. In addition, it remains extremely stable even at high temperature while retaining its flexibility at low temperatures. PTFE is also nonflammable and has a UL 94 Flame Rating of 94 V-0.<o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 13pt;">3. Extreme Chemical Inertness<o:p></o:p></span></h2>
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<strong><span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;">PTFE is one of the most chemically compatible polymers on the market today.</span></strong><span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;"> It will not contaminate any sensitive media it comes into contact with, and is non-soluble. This makes it ideal for the aggressive chemicals encountered in aerospace applications, including jet fuels, degreasers, and hydraulic fluids. Its primary weakness is alkali metals.<o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 13pt;">4. Wide Pressure Range<o:p></o:p></span></h2>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;">Aerospace seals typically need to operate under extreme pressures, often ranging from 20 ksi to vacuum pressures. Note that there are blends of <a href="http://www.ptfe-machinery.com/">PTFE</a> specifically for high PV applications<strong> </strong>such as those encountered in aerospace applications. It is also known for its excellent compressive strength.<o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 13pt;">Other Excellent Qualities<o:p></o:p></span></h2>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;">Another key aspect of PTFE spring energized seals is the incredible wear properties that PTFE possesses. It also exhibits very, very low water absorption due to its hydrophobic nature, which also makes it easy to clean. <a href="http://www.ptfe-machinery.com/">PTFE</a> is compatible with a variety of fillers that can improve its various properties so that it can be better tailored to meet design needs. It also offers excellent stiffness and outstanding dimensional stability.<o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 13pt;">Power of Spring-Energized PTFE Seals<o:p></o:p></span></h2>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;">PTFE has excellent characteristics for aerospace applications, from its wide range of both operating pressures and temperatures to its chemical resistivity and dimensional stability. When such properties are combined with its ease of manufacture and its performance in extreme environments, it’s easy to see why PTFE energized seals are a first choice for many aerospace engineers.</span><br />
<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;">Tags:ptfe,teflon ptfe,seals</span>PTFE Machineryhttp://www.blogger.com/profile/11221386967155866041noreply@blogger.com0tag:blogger.com,1999:blog-8512558734070384940.post-45991092436787299442018-06-25T01:27:00.000-07:002018-06-25T01:27:20.681-07:005 Reasons Why PTFE Seals are an Excellent Choice for Automotive Applications<div align="left" class="MsoNormal" style="background: white; line-height: 18.75pt; margin: 3.75pt 0cm 7.5pt;">
<b><span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 16pt;">Automotive PTFE Shaft Seals<span style="color: #418bec;"><o:p></o:p></span></span></b></div>
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<span lang="EN-US" style="color: #616e7f; font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">I</span><span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">n this article, we are going to explore the reasons why <a href="http://www.ptfe-machinery.com/">PTFE</a> seals are among the best choices for many automotive applications. You’ll find PTFE seals in fuel cell seals, fuel injection pumps, steering wheel seals, air conditioning, compressor seals, hydraulic seals, and more. We’re going to focus our attention on PTFE shaft seals. Let’s take a look!<o:p></o:p></span></div>
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<b><span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 13pt;">Reason #1: Low Friction<o:p></o:p></span></b></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">PTFE shaft seals have unbelievably low friction and are long lasting, keeping the fluids where they are supposed to be. They are also capable of dry running, since they are self-lubricating and don’t require additional lubrication in order to perform well.<o:p></o:p></span></div>
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<b><span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 13pt;">Reason #2: Chemically Resistant<o:p></o:p></span></b></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">PTFE rotating shaft seals also perform extremely well in the presence of automotive fluids, including fluids and chemically aggressive oils. They are regularly used with diesel and gasoline, as well as alternative fuels. In fact, PTFE seals are among the most chemically resistant polymers on the market today. <o:p></o:p></span></div>
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<b><span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 13pt;">Reason #3: Performance at High Temperatures<o:p></o:p></span></b></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">At high temperatures where other seals may begin to fail, PTFE dynamic shaft seals keep going strong. They retain their performance characteristics even at abusive temperatures up to 600°F. This includes their stiffness, strength, chemical resistance, low friction, dimensional stability, and durability.<o:p></o:p></span></div>
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<b><span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 13pt;">Reason #4: Survival at High Surface Speeds<o:p></o:p></span></b></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">PTFE dynamic seals work extremely well for demanding high surface speed applications because of their resistance to the effects of heat and their ultra-low friction characteristics, performing much better than their elastomeric counterparts.<o:p></o:p></span></div>
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<b><span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 13pt;">Reason #5: Reduction in Vehicle Emissions<o:p></o:p></span></b></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">Because of the reliable sealing power of <a href="http://www.ptfe-machinery.com/">PTFE</a>, automobiles that make use of PTFE seals typically have lower vehicle emissions and CO</span><sub><span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 9pt;">2</span></sub><span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">. This is a powerful combination in a modern automotive industry where federal oversight and regulations are pushing toward more eco-friendly vehicles.<o:p></o:p></span></div>
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<b><span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 16pt;">High Performance PTFE<o:p></o:p></span></b></div>
<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;">PTFE rotary shaft seals are an increasingly common sight in the automotive industry, and far more reasons than just their low friction, chemical resistance, performance at high temperatures, survival at high surface speeds, and reduction in vehicle emissions. If you are looking for a high performance, durable, reliable seal, don’t forget to check out<a href="http://www.ptfe-machinery.com/"> PTFE</a>.</span><br />
<span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.5pt;">Tags:PTFE,teflon ptfe,seal</span>PTFE Machineryhttp://www.blogger.com/profile/11221386967155866041noreply@blogger.com0tag:blogger.com,1999:blog-8512558734070384940.post-78394328493668333642018-06-21T01:46:00.000-07:002018-06-21T01:46:05.692-07:004 Reasons: PTFE Rotary Shaft Seals for Low Friction High Speed Applications<br />
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-bidi-font-weight: bold; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">PTFE rotary shaft seals<b> </b></span><span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">are an excellent solution to high speed applications with surface speeds up to 30 m/s. In this article, we are going to look at<span style="mso-bidi-font-style: italic; mso-bidi-font-weight: bold;"> four reasons</span> behind that continued popularity. <o:p></o:p></span></div>
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<b><span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 13pt;">Reason # 1 Low Friction<o:p></o:p></span></b></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-bidi-font-weight: bold; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">PTFE</span><span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">, also known as </span><span lang="EN-US"><span style="color: windowtext; font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-bidi-font-style: italic; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt; text-decoration: none; text-underline: none;">Polytetrafluoroethylene</span></span><span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;"> or by its trademarked name <span style="mso-bidi-font-weight: bold;"><a href="http://www.ptfe-machinery.com/">Teflon</a></span>, has one of the lowest coefficient of friction of any solid known to mankind, even when in contact with metal. It’s usually estimated at 0.05 to 0.10 for <a href="http://www.ptfe-machinery.com/">virginPTFE</a>. Because of this extremely low friction, in many rotary applications there will be significantly less frictional drag when compared to options, such as conventional rubber shaft seals.<o:p></o:p></span></div>
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<b><span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 13pt;">Reason # 2 Film Transfer<o:p></o:p></span></b></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">When PTFE rubs against a hard surface, it transfers a microscopic layer to that counter surface. This contributes to its extremely low coefficient of friction. <span style="mso-bidi-font-weight: bold;">Here’s how engineers and scientist describe the process:</span><o:p></o:p></span></div>
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<li class="MsoNormal" style="background: white; mso-list: l0 level1 lfo1; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto; mso-pagination: widow-orphan; tab-stops: list 36.0pt; text-align: left;"><span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">The molecules on the contacting surface of <a href="http://www.ptfe-machinery.com/">PTFE</a> are deformed due to applied forces acting at that surface.<o:p></o:p></span></li>
<li class="MsoNormal" style="background: white; mso-list: l0 level1 lfo1; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto; mso-pagination: widow-orphan; tab-stops: list 36.0pt; text-align: left;"><span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">The molecules begin to stretch along the direction of the sliding motion.<o:p></o:p></span></li>
<li class="MsoNormal" style="background: white; mso-list: l0 level1 lfo1; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto; mso-pagination: widow-orphan; tab-stops: list 36.0pt; text-align: left;"><span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">Because of the weak intermolecular forces, PTFE molecules are transferred to the counter surface in a film between 50 to 200 <span style="mso-bidi-font-style: italic;">Angstroms</span> thick.<o:p></o:p></span></li>
<li class="MsoNormal" style="background: white; mso-list: l0 level1 lfo1; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto; mso-pagination: widow-orphan; tab-stops: list 36.0pt; text-align: left;"><span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">As a result, PTFE is now sliding on PTFE instead of directly on the counter surface.<o:p></o:p></span></li>
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<b><span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 13pt;">Reason # 3 Dry Running<o:p></o:p></span></b></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">Another awesome feature of PTFE is its ability to perform without additional lubrication. PTFE is actually classified as a <span style="mso-bidi-font-style: italic;">self-lubricating polymer</span>. It offers reduced stiction and breakout friction, which can be key for many rotary applications. <o:p></o:p></span></div>
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<b><span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 13pt;">Reason # 4 Chemical Resistivity<o:p></o:p></span></b></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">Another facet of PTFE that makes it popular as a shaft sealing material is its <span style="mso-bidi-font-style: italic;">chemical resistivity</span>. The list of chemicals that can attack PTFE is short, and primarily consists of <span style="mso-bidi-font-weight: bold;">alkali metals</span>, such as <span style="mso-bidi-font-style: italic;">elemental sodium</span>, and <i>rare fluorinated solutions</i>. This chemical inertness is said to be a result of carbon-fluorine bonds in PTFE.<o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">Another interesting facet of PTFE is its <span style="mso-bidi-font-style: italic;">hydrophobic</span> behavior, whereby it repels water and water-containing substances. The hydrophobic behavior aids in its chemical inertness, and also makes it easier to keep clean. This behavior due in part to the high electronegativity of fluorine.<o:p></o:p></span></div>
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<b><span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 13pt;"><br />CONCLUSION:<o:p></o:p></span></b></div>
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<span lang="EN-US" style="font-family: "arial" , "sans-serif"; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">Of course, there are more reasons behind the popularity of <a href="http://www.ptfe-machinery.com/">PTFE</a> for rotary shaft seals in high speed applications. PTFE has an <i>extended shelf life,</i> can <i>perform at both cryogenic </i>and<i> extremely high temperatures</i>, and is known for its<i> easy installation</i>. However, the main reasons are its<i> low friction, film transfer, dry running, and chemical resistivity.</i><o:p></o:p></span></div>
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<b style="mso-bidi-font-weight: normal;"><span lang="EN-US" style="font-size: 14pt;">Tags:ptfe teflon,teflon,seals<o:p></o:p></span></b><br />
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PTFE Machineryhttp://www.blogger.com/profile/11221386967155866041noreply@blogger.com0tag:blogger.com,1999:blog-8512558734070384940.post-47081134592191183572018-06-13T00:49:00.000-07:002018-06-13T00:49:31.989-07:00PTFE Guidewire Application Process Eliminates Delamination<div align="left" class="MsoNormal" style="background: white; line-height: 24pt; margin: 9pt 0cm;">
<i><span lang="EN-US" style="color: #333333; font-family: "arial" , "sans-serif"; font-size: 15pt;">Solution proven to have no PTFE delamination for 34,000,000+ guidewires.<o:p></o:p></span></i></div>
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<span lang="EN-US" style="background: white; color: #333333; font-family: "arial" , "sans-serif"; font-size: 12pt;">The guidewire coating delamination problem reached catastrophic proportions late last year. In October, Medtronic—a major guidewire supplier—recalled over 84,000 units that had the potential for the PTFE coating to flake off. But Medtronic was not alone; other manufacturers have recalled guidewires, too.</span><span lang="EN-US" style="color: #333333; font-family: "arial" , "sans-serif"; font-size: 12pt;"><br /><br /><span style="background: white;"><o:p></o:p></span></span></div>
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<span lang="EN-US" style="background: white; color: #333333; font-family: "arial" , "sans-serif"; font-size: 12pt;">These were FDA Class 1 recalls, meaning these guidewires and microguidewires represented serious health risks in which the applied coating—<a href="http://www.ptfe-machinery.com/">PTFE</a> in this case—had the potential to delaminate or flake off. If this occurs before or during a medical procedure and even a microscopic flake enters the patient’s bloodstream, the results can be serious, including blood clots, stroke, heart attack, tissue necrosis, and even death. Between January 2014 and November 2015, the FDA received approximately 500 Medical Device Reports—including reports of nine deaths—attributed to PTFE coating delaminating from guidewires.</span><span lang="EN-US" style="color: #333333; font-family: "arial" , "sans-serif"; font-size: 12pt;"><br /><span style="background: white;"> </span></span><span lang="EN-US" style="font-size: 12pt;"><o:p></o:p></span></div>
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<span lang="EN-US" style="background: white; color: #333333; font-family: "arial" , "sans-serif"; font-size: 12pt;">The medical ramifications to the patient and their family are undeniably devastating. For the guidewire manufacturer, the results can also be catastrophic. Based on other comparable recalls, the device manufacturer will take a substantial hit to their reputation and see their stock prices and market cap often falling 10 percent from a single incident.</span><span lang="EN-US" style="color: #333333; font-family: "arial" , "sans-serif"; font-size: 12pt;"><br /><span style="background: white;"> <o:p></o:p></span></span></div>
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<span lang="EN-US" style="background: white; color: #333333; font-family: "arial" , "sans-serif"; font-size: 12pt;">Further, there is the matter of unresolved liability. Defending a lawsuit stemming from blood clots, stroke, or death resulting from a faulty guidewire would undoubtedly be a costly endeavor, and the damages available to the patients and their families can be significant. There is no set benchmark for the types of damages available in these cases, particularly when the damage done to a patient is open-ended and requires ongoing treatment or hospitalization, which may make early resolution more difficult. Litigants and the courts will invariably look to other defective medical products for guidance. “The lawsuits that stem from defective catheter guidewires may follow the pattern established for the IVC filters that were designed to block blood clots,” explained Rachel V. Rose, a trial lawyer in Houston who is experienced in medical litigation. “In the case of guidewires, look for ‘bellwether’ cases in different parts of the nation to set the standard for monetary awards.”</span><span lang="EN-US" style="color: #333333; font-family: "arial" , "sans-serif"; font-size: 12pt;"><br /><span style="background: white;"> <o:p></o:p></span></span></div>
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<span lang="EN-US" style="background: white; color: #333333; font-family: "arial" , "sans-serif"; font-size: 12pt;">Coating a guidewire with PTFE is necessary for its smooth operation in the peripheral, coronary, and neuro vasculature. The coating reduces friction and eliminates the potential for binding and kinking during a procedure and, from the physician’s standpoint, the motion of the guidewire needs to be smooth and unhesitating. The difference in the tactile feel of a guidewire without and with PTFE is dramatic.<o:p></o:p></span></div>
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<span lang="EN-US" style="background: white; color: #333333; font-family: "arial" , "sans-serif"; font-size: 12pt;">The origin of the problem of <a href="http://www.ptfe-machiney.com/">PTFE</a> flaking on guidewires appears to correspond with the Environmental Protection Agency’s mandate earlier in this decade to eliminate the surfactant—PFOA—from water-borne PTFE formulations because PFOA is a suspected carcinogen. For 50 years, pure PTFE, with the aid of PFOA, had been the gold standard coating for guidewires. It is believed that PFOA improved adhesion to smooth metal surfaces, including guidewires. Without it, the flaking problem struck with a vengeance, especially when guidewires were soaked before use in the ever-present saline used in medical procedures. Saline penetrates the porous coating and, if adhesion is marginal, causes it to bubble and delaminate. Reports from operating theaters indicated that guidewires coated with the new PFOA-free PTFE were visibly flaking after being placed in saline soaking tanks.</span><span lang="EN-US" style="color: #333333; font-family: "arial" , "sans-serif"; font-size: 12pt;"><br /><span style="background: white;"> <o:p></o:p></span></span></div>
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<span lang="EN-US" style="background: white; color: #333333; font-family: "arial" , "sans-serif"; font-size: 12pt;">An initial “fix” for the delamination problem was to switch from pure <a href="http://www.ptfe-machinery.com/">PTFE</a> to resin-bonded PTFE. These early formulations are based on particles of pure PTFE and other low-friction particles, suspended in a tough polymer resin. While adhesion was improved, friction became a problem. While the coefficient of friction of pure PTFE is as low as 0.02 (similar to ice), the original resin-bonded coatings often had between 1.5 to 4 times more friction. Over time, the friction of the resin-bonded coatings has been improved, but not to the level of pure PTFE. This means the smooth operating feel of the old coated guidewires was lost, and the tactile feedback sensed by a physician operator is heavier, hesitant, and jerky. Known as “stick-slip,” this phenomenon is the transition from static friction to dynamic friction. Some physicians reported that they could not differentiate between a vascular obstruction and a momentary resistance of the guidewire.</span><span lang="EN-US" style="color: #333333; font-family: "arial" , "sans-serif"; font-size: 12pt;"><br /><span style="background: white;"> <o:p></o:p></span></span></div>
<span lang="EN-US" style="background: white; color: #333333; font-family: "arial" , "sans-serif"; font-size: 12pt;">There is another potential problem with resin-bonded <a href="http://www.ptfe-machinery.com/">PTFE</a>: an unknown shelf life. If the substitute coating is not completely cured, it contains solvents that could adversely affect packaging, while the original water-based coatings had no such issue. Given all of this information, it appears that PTFE would be the ideal coating for guidewires as long as the delamination problem could be resolved once and for all.</span><br />
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<span lang="EN-US" style="background: white; color: #333333; font-family: "arial" , "sans-serif"; font-size: 12pt;">Tags:teflon,ptfe teflon,gudiewire</span></div>
PTFE Machineryhttp://www.blogger.com/profile/11221386967155866041noreply@blogger.com0tag:blogger.com,1999:blog-8512558734070384940.post-68324099485741044872018-06-11T01:34:00.000-07:002018-06-11T01:34:10.135-07:00The Impact of Fluoropolymers on the Medical Device Industry<br />
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<span lang="EN-US">The impressive growth of the medical device, biomedical and healthcare industries over the past 15 years continues unabated even as materials such as fluoropolymers are meeting the increasingly challenging demand for new products and procedures. In general, fluoropolymers are progressively replacing other plastics in medical applications owing to their ability to meet the physical and biocompatibility requirements of the next generation drugs and devices.<span style="mso-spacerun: yes;"> </span>Fluoropolymers meet a unique set of performance criteria in such applications. These include biocompatibility, lubricity, sterilization, chemical inertness, a wide temperature use range, low binding to process equipment, high-purity with low extractables, dielectric properties, and USP Class VI certification.<o:p></o:p></span></div>
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<span lang="EN-US">The family of available fluoropolymers that meet the above needs include grades of <a href="http://www.ptfe-machinery.com/">PTFE</a>, FEP, PFA and PVDF resin from various resin producers. PTFE(<a href="http://www.ptfe-machinery.com/">teflon</a>) has a well-established implant history of soft tissue replacement due to its biocompatibility and inertness. Resin and downstream product manufacturers continue to respond to new performance requirements by making appropriate modifications to the chemistry of the resin and surface configuration of the products, respectively.<o:p></o:p></span></div>
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<span lang="EN-US">The biocompatibility of any polymer is a principal requirement in any medical device such as catheters, bio-containment vessels, syringes and sutures. PTFE, FEP and PVDF are well established biocompatible materials, and their lubricity and chemical resistance make them the material of choice for products such as multi lumen tubing and others that are used in minimally invasive procedures. Multi lumen fluoropolymer catheter tubing for example allows surgeons to perform multiple procedures using the same catheter.<o:p></o:p></span></div>
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<span lang="EN-US">Fluoropolymers, especially PTFE(<a href="http://www.ptfe-machinery.com/">teflon</a>)and PVDF are widely used in microporous membranes. Membranes, containing billions of pores ranging in size from 0.01 to 10 microns act as filters for particles and bacteria in critical fluids. PTFE and PVDF are among the few polymers used for filter membranes. The surfaces of the polymers membranes can be modified to deliver specific filtration properties and can be hydrophobic (water repelling) and oleophobic (oil, solvent, low surface tension fluid repelling). PVDF membranes can be also be surface modified to be hydrophilic (water loving) for removal of viral particles in the manufacture of therapeutic proteins and monoclonal antibodies. PVDF blotting membranes are particularly well suited for low background immunoblotting (western blot analysis), as well as for amino acid analysis and protein sequencing.<o:p></o:p></span></div>
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<span lang="EN-US">Accessory equipment, such as pumps, tubing, fittings used in conjunction with medical devices must meet similar performance and specification parameters. Accessories in direct contact with fluids are constructed of fluoropolymers such as PTFE and PVDF. For example, metering pumps such as diaphragm pumps are required for precise and repeatable flow, sometimes for chemically aggressive fluids.<span style="mso-spacerun: yes;"> </span>Both PTFE and PVDF tubing are used in the construction of these pumps for this reason.<o:p></o:p></span></div>
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<span lang="EN-US">PVDF, although having a lower use temperature limit than PTFE(<a href="http://www.ptfe-machinery.com/">teflon</a>), has a relatively high tensile strength and excellent permeation resistance to many fluids. It has a lower density (1.78 g/cc) than other fluoropolymers (approximately 2.18 g/cc). Due to a lower melting temperature than other fluoropolymers, it is more easily processible into products such as pipes, tubes, injection molded parts and films. It offers excellent dimensional and UV stability and is therefore finding new uses in aerospace, sensors, biotechnology and robotics markets.<o:p></o:p></span></div>
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<span lang="EN-US">Tags:teflon, Fluoropolymers,medical device<o:p></o:p></span><br />
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PTFE Machineryhttp://www.blogger.com/profile/11221386967155866041noreply@blogger.com0tag:blogger.com,1999:blog-8512558734070384940.post-72795978056426911692018-06-04T01:11:00.000-07:002018-06-04T01:11:34.471-07:00TEFLON, AN INVENTION THAT STICKS<div style="background: white; margin: 0cm; vertical-align: baseline;">
<strong><span lang="EN-US" style="border: 1pt none; font-family: "helvetica" , sans-serif; font-size: 15pt; padding: 0cm;">1938:</span></strong><span lang="EN-US" style="font-family: "georgia" , serif; font-size: 13.5pt;"> Fiddling around in the lab one day, Roy Plunkett accidentally discovers polytetrafluoroethylene, soon to be known as <a href="http://www.ptfe-machinery.com/">Teflon</a>, a slippery substance that will have practical applications in everything from nonstick cookware to a presidential nickname.<o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "georgia" , serif; font-size: 13.5pt;">Plunkett, a chemist at DuPont's Jackson research lab in New Jersey, </span><span lang="EN-US" style="border: 1pt none; font-family: "inherit" , "serif"; font-size: 13.5pt; padding: 0cm;">made his discovery</span><span lang="EN-US" style="font-family: "georgia" , serif; font-size: 13.5pt;"> in the time-honored scientific way: as the result of a mistake, and with an assistant's help.<o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "georgia" , serif; font-size: 13.5pt;">Plunkett and his assistant, Jack Rebok, were testing the chemical reactions of </span><span lang="EN-US" style="border: 1pt none; font-family: inherit , serif; font-size: 13.5pt; padding: 0cm;">tetrafluoroethylene</span><span lang="EN-US" style="font-family: "georgia" , serif; font-size: 13.5pt;">, a gas used in </span><span lang="EN-US" style="border: 1pt none; font-family: "inherit" , "serif"; font-size: 13.5pt; padding: 0cm;">refrigeration</span><span lang="EN-US" style="font-family: "georgia" , serif; font-size: 13.5pt;">. The gas was contained in some pressurized canisters, one of which failed to discharge properly when its valve was opened.<o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "georgia" , serif; font-size: 13.5pt;">Rebok picked up the canister, only to find that it was heavier than an empty canister would be. He suggested cutting it open to see what had happened and, despite the risk of blowing the lab to kingdom come, Plunkett agreed.<o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "georgia" , serif; font-size: 13.5pt;">Of course, it was heavy: The gas hadn't accidentally escaped. It had solidified into a smooth, slippery white powder as the result of its molecules bonding, a process known as polymerization.<o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "georgia" , serif; font-size: 13.5pt;">This new </span><span lang="EN-US" style="border: 1pt none; font-family: "inherit" , "serif"; font-size: 13.5pt; padding: 0cm;">polymer</span><span lang="EN-US" style="font-family: "georgia" , serif; font-size: 13.5pt;"> was different from similar solids like graphite: It was lubricated better and extremely heat-resistant, due to the presence of dense fluorine atoms that shielded the compound's string of carbon atoms.<o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "georgia" , serif; font-size: 13.5pt;">Setting other work aside, Plunkett began testing the possibilities of polytetrafluoroethylene, eventually figuring out how to reproduce the polymerization process that had occurred accidentally the first time.<o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "georgia" , serif; font-size: 13.5pt;">DuPont patented the polymer in 1941, registering it under the trade name </span><span lang="EN-US" style="border: 1pt none; font-family: "inherit" , "serif"; font-size: 13.5pt; padding: 0cm;">Teflon</span><span lang="EN-US" style="font-family: "georgia" , serif; font-size: 13.5pt;"> in 1944. The first products — most having military and industrial applications — came to market after World War II. It wouldn't be until the early 1960s that Teflon became a household word when it was used to produce the most effective, heat-resistant cookware yet seen.<o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "georgia" , serif; font-size: 13.5pt;">The word gained a certain pop-culture notoriety in the 1980s when the media began referring to Ronald Reagan as the Teflon president, a reference to his infuriating ability to avoid being tarnished by the </span><span lang="EN-US" style="border: 1pt none; font-family: "inherit" , "serif"; font-size: 13.5pt; padding: 0cm;">various scandals</span><span lang="EN-US" style="font-family: "georgia" , serif; font-size: 13.5pt;"> plaguing his administration.<o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "georgia" , serif; font-size: 13.5pt;"><a href="http://www.ptfe-machinery.com/">Teflon</a> cookware, however, remained as steadfast and reliable as ever.<o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "georgia" , serif; font-size: 13.5pt;"><a href="http://www.ptfe-machinery.com/">Teflon</a> is found virtually everywhere today, coating metals and fabrics, from the aerospace industry to clothing to pharmaceuticals.<o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "georgia" , serif; font-size: 13.5pt;">For his discovery, Plunkett, who retired from DuPont in 1975, was enshrined in the </span><span lang="EN-US" style="border: 1pt none; font-family: "inherit" , "serif"; font-size: 13.5pt; padding: 0cm;">National Inventors Hall of Fame</span><span lang="EN-US" style="font-family: "georgia" , serif; font-size: 13.5pt;">.<o:p></o:p></span></div>
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<em><span lang="EN-US" style="border: 1pt none; font-family: "georgia" , serif; font-size: 13.5pt; padding: 0cm;">Source: </span></em><span class="skimlinks-unlinked"><span lang="EN-US" style="border: 1pt none; font-family: inherit , serif; font-size: 13.5pt; padding: 0cm;">About.com</span></span><em><span lang="EN-US" style="border: 1pt none; font-family: "georgia" , serif; font-size: 13.5pt; padding: 0cm;">, Wikipedia</span></em><span lang="EN-US" style="font-family: "georgia" , serif; font-size: 13.5pt;"><o:p></o:p></span></div>
<span lang="EN-US" style="font-family: "georgia" , serif; font-size: 13.5pt;">Teflon-coated cooking tools like this muffin tin and baking tray have eased setup and cleanup in millions of kitchens.</span><br />
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PTFE Machineryhttp://www.blogger.com/profile/11221386967155866041noreply@blogger.com0tag:blogger.com,1999:blog-8512558734070384940.post-22524148473248625982018-06-01T23:06:00.000-07:002018-06-01T23:06:59.741-07:008 Applications of PTFE Tubing<div class="MsoNormal">
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<span lang="EN-US">1. Aircraft Industries<a href="http://www.ptfe-machinery.com/"> PTFE tubings</a> are the non-flammable fluoropolymers that have lower friction coefficient which make them able to work properly under extreme temperature and pressure that's why these tubings are being used in the aircraft industries to wrap the wiring and cables.<o:p></o:p></span></div>
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<span lang="EN-US">2. Automotive Industries In the automobile engine, for fuel evaporation and fuel rails a high quality tubing is used which is made of Teflon PTFE which has low gas permeability.<o:p></o:p></span></div>
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<span lang="EN-US">3. Electrical Industries In electrical industries, to cover the electric wires and cables a high quality Teflon PTFE tubing is used that can bear the high temperature and protect the wire from any cuts. Also, these tubings are avalable in multi-colors that helps to identify the wires during the connection at homes or offices.<o:p></o:p></span></div>
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<span lang="EN-US">4. Medical Apparatus and Devices Fluoropolymers are used in medical industries to manufacture various instruments and devices like drainage tubings, ventilators, earpieces, aprones, gloves and other artificial tissues. Along with these, many functional devices which doctors use in biochemical analysis of human body are also made of the <a href="http://www.ptfe-machinery.com/">Teflon ptfe</a>.<o:p></o:p></span></div>
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<span lang="EN-US">5. Food Industries In food industries for food processing special rollers are used. To expand the lifeline of these rollers wrap of Teflon FEP roll covers are done which are also non-sticky in nature that helps to maintain the quality of the product.<o:p></o:p></span></div>
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<span lang="EN-US">6. Textile Industries The transfer of chemicals in the pipes used in the textile industries cause corrosion. So, to avoid this problem Teflon TPFE tubings are used and also on the textile rollers the coating of PTFE done.<o:p></o:p></span></div>
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<span lang="EN-US">7. 3D Printing Industries In 3D printing, the filament should be transferred to the printing nozzle which have to perform under high temperature range. Since, the PTFE tubing has high temperature coefficient along with non-sticky nature which helps to easily slip the material from the nozzle so that it is most preferable polymer in the 3D printing industries.<o:p></o:p></span></div>
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<span lang="EN-US">8. Chemical Industries Non-alkali nature of the <a href="http://www.ptfe-machinery.com/">Teflon PTFE</a> make it able to use in the chemical industries where transfer of the highly sensitive fluids is a common thing.<o:p></o:p></span></div>
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PTFE Machineryhttp://www.blogger.com/profile/11221386967155866041noreply@blogger.com0tag:blogger.com,1999:blog-8512558734070384940.post-48173536212489121902018-05-31T00:09:00.000-07:002018-05-31T00:13:15.548-07:00Teflon and Perfluorooctanoic Acid (PFOA)<div align="left" class="MsoNormal" style="background: white; margin-bottom: 18.75pt;">
<b><span lang="EN-US" style="color: #1e1e23; font-family: "arial" , "sans-serif"; font-size: 24pt;">What are Teflon and PFOA? Where are they found?<o:p></o:p></span></b></div>
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<span lang="EN-US" style="color: #1e1e23; font-family: "arial" , "sans-serif"; font-size: 13.5pt;">Teflon</span><sup><span lang="EN-US" style="color: #1e1e23; font-family: "arial" , "sans-serif"; font-size: 10pt;">®</span></sup><span lang="EN-US" style="color: #1e1e23; font-family: "arial" , "sans-serif"; font-size: 13.5pt;"> is a brand name for a man-made chemical known as polytetrafluoroethylene (PTFE). It has been in commercial use since the 1940s. It has a wide variety of uses because it is extremely stable (it doesn’t react with other chemicals) and can provide an almost frictionless surface. Most people are familiar with it as a non-stick coating surface for pans and other cookware. It is also used in many other products, such as fabric protectors.<o:p></o:p></span></div>
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<span lang="EN-US" style="color: #1e1e23; font-family: "arial" , "sans-serif"; font-size: 13.5pt;">Perfluorooctanoic acid (PFOA), also known as C8, is another man-made chemical. It is used in the process of making Teflon and similar chemicals (known as fluorotelomers), although it is burned off during the process and is not present in significant amounts in the final products.<o:p></o:p></span></div>
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<span lang="EN-US" style="color: #1e1e23; font-family: "arial" , "sans-serif"; font-size: 13.5pt;">PFOA has the potential to be a health concern because it can stay in the environment and in the human body for long periods of time. Studies have found that it is present worldwide at very low levels in just about everyone’s blood. Higher blood levels have been found in community residents where local water supplies have been contaminated by PFOA. People exposed to PFOA in the workplace can have levels many times higher.<o:p></o:p></span></div>
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<span lang="EN-US" style="color: #1e1e23; font-family: "arial" , "sans-serif"; font-size: 13.5pt;">PFOA and some similar compounds can be found at low levels in some foods, drinking water, and in household dust. Although PFOA levels in drinking water are usually low, they can be higher in certain areas, such as near chemical plants that use PFOA.<o:p></o:p></span></div>
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<span lang="EN-US" style="color: #1e1e23; font-family: "arial" , "sans-serif"; font-size: 13.5pt;">People can also be exposed to PFOA from ski wax or from fabrics and carpeting that have been treated to be stain resistant. Non-stick cookware is not a significant source of PFOA exposure.<o:p></o:p></span></div>
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<b><span lang="EN-US" style="color: #1e1e23; font-family: "arial" , "sans-serif"; font-size: 24pt;">Do Teflon and PFOA cause cancer?<o:p></o:p></span></b></div>
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<b><span lang="EN-US" style="color: #1e1e23; font-family: "arial" , "sans-serif"; font-size: 18pt;">Teflon<o:p></o:p></span></b></div>
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<span lang="EN-US" style="color: #1e1e23; font-family: "arial" , "sans-serif"; font-size: 13.5pt;"><a href="http://www.ptfe-machinery.com/">Teflon</a> itself is not suspected of causing cancer.<o:p></o:p></span></div>
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<b><span lang="EN-US" style="color: #1e1e23; font-family: "arial" , "sans-serif"; font-size: 18pt;">PFOA<o:p></o:p></span></b></div>
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<span lang="EN-US" style="color: #1e1e23; font-family: "arial" , "sans-serif"; font-size: 13.5pt;">Many studies in recent years have looked at the possibility of PFOA causing cancer. Researchers use 2 main types of studies to try to figure out if such a substance might cause cancer.<o:p></o:p></span></div>
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<b><span lang="EN-US" style="color: #1e1e23; font-family: "arial" , "sans-serif"; font-size: 13.5pt;">Studies in the lab</span></b><span lang="EN-US" style="color: #1e1e23; font-family: "arial" , "sans-serif"; font-size: 13.5pt;"><o:p></o:p></span></div>
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<span lang="EN-US" style="color: #1e1e23; font-family: "arial" , "sans-serif"; font-size: 13.5pt;">In studies done in the lab, animals are exposed to a substance (often in very large doses) to see if it causes tumors or other health problems. Researchers might also expose human cells in a lab dish to the substance to see if it causes the types of changes that are seen in cancer cells.<o:p></o:p></span></div>
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<span lang="EN-US" style="color: #1e1e23; font-family: "arial" , "sans-serif"; font-size: 13.5pt;">Studies in lab animals have found exposure to PFOA increases the risk of certain tumors of the liver, testicles, mammary glands (breasts), and pancreas in these animals. In general, well-conducted studies in animals do a good job of predicting which exposures cause cancer in people. But it isn’t clear if the way this chemical affects cancer risk in animals would be the same in humans.<o:p></o:p></span></div>
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<b><span lang="EN-US" style="color: #1e1e23; font-family: "arial" , "sans-serif"; font-size: 13.5pt;">Studies in humans</span></b><span lang="EN-US" style="color: #1e1e23; font-family: "arial" , "sans-serif"; font-size: 13.5pt;"><o:p></o:p></span></div>
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<span lang="EN-US" style="color: #1e1e23; font-family: "arial" , "sans-serif"; font-size: 13.5pt;">Some types of studies look at cancer rates in different groups of people. These studies might compare the cancer rate in a group exposed to a substance to the cancer rate in a group not exposed to it, or compare it to the cancer rate in the general population. But sometimes it can be hard to know what the results of these types of studies mean, because many other factors might affect the results.<o:p></o:p></span></div>
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<span lang="EN-US" style="color: #1e1e23; font-family: "arial" , "sans-serif"; font-size: 13.5pt;">Studies have looked at people exposed to PFOA from living near or working in chemical plants. Some of these studies have suggested an increased risk of testicular cancer with increased PFOA exposure. Studies have also suggested possible links to kidney cancer and thyroid cancer, but the increases in risk have been small and could have been due to chance.<o:p></o:p></span></div>
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<span lang="EN-US" style="color: #1e1e23; font-family: "arial" , "sans-serif"; font-size: 13.5pt;">Other studies have suggested possible links to other cancers, including <span style="color: #1e1e23; text-decoration-line: none;">prostate</span>, <span style="color: #1e1e23; text-decoration-line: none;">bladder</span>, and <span style="color: #1e1e23; text-decoration-line: none;">ovarian cancer</span>. But not all studies have found such links, and more research is needed to clarify these findings.<o:p></o:p></span></div>
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<b><span lang="EN-US" style="color: #1e1e23; font-family: "arial" , "sans-serif"; font-size: 18pt;">What expert agencies say<o:p></o:p></span></b></div>
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<span lang="EN-US" style="color: #1e1e23; font-family: "arial" , "sans-serif"; font-size: 13.5pt;">Several national and international agencies study different substances in the environment to determine if they can cause cancer. (A substance that causes cancer or helps cancer grow is called a <i>carcinogen</i>.) The American Cancer Society looks to these organizations to evaluate the risks based on evidence from laboratory, animal, and human research studies.<o:p></o:p></span></div>
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<span lang="EN-US" style="color: #1e1e23; font-family: "arial" , "sans-serif"; font-size: 13.5pt;">The <b>International Agency for Research on Cancer (IARC)</b> is part of the World Health Organization (WHO). One of its goals is to identify causes of cancer. IARC has classified PFOA as “possibly carcinogenic to humans” (Group 2B), based on limited evidence in humans that it can cause testicular and kidney cancer, and limited evidence in lab animals.<o:p></o:p></span></div>
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<span lang="EN-US" style="color: #1e1e23; font-family: "arial" , "sans-serif"; font-size: 13.5pt;">(For more information on the classification system IARC uses, see <span style="color: #1e1e23; text-decoration-line: none;">Known and Probable Human Carcinogens</span>.)<o:p></o:p></span></div>
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<span lang="EN-US" style="color: #1e1e23; font-family: "arial" , "sans-serif"; font-size: 13.5pt;">The US <b>Environmental Protection Agency (EPA)</b> maintains the Integrated Risk Information System (IRIS), an electronic database that contains information on human health effects from exposure to various substances in the environment. The EPA has not officially classified PFOA as to its carcinogenicity.<o:p></o:p></span></div>
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<span lang="EN-US" style="color: #1e1e23; font-family: "arial" , "sans-serif"; font-size: 13.5pt;">In a draft (not final) report, the EPA’s Scientific Advisory Board examined the evidence on PFOA, mainly from studies in lab animals, and stated that there is “suggestive evidence of carcinogenicity, but not sufficient to assess human carcinogenic potential.” The board agreed that new evidence would be considered as it becomes available.<o:p></o:p></span></div>
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<span lang="EN-US" style="color: #1e1e23; font-family: "arial" , "sans-serif"; font-size: 13.5pt;">Other agencies have not yet formally evaluated whether PFOA can cause cancer.<o:p></o:p></span></div>
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<b><span lang="EN-US" style="color: #1e1e23; font-family: "arial" , "sans-serif"; font-size: 24pt;">What is being done about PFOA?<o:p></o:p></span></b></div>
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<span lang="EN-US" style="color: #1e1e23; font-family: "arial" , "sans-serif"; font-size: 13.5pt;">The long-term effects of <a href="http://www.ptfe-machinery.com/">PFOA</a> and similar chemicals are largely unknown, but there has been enough concern to prompt an attempt to phase out industrial emissions of them. Only a handful of companies have used these chemicals in manufacturing in recent years.<o:p></o:p></span></div>
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<span lang="EN-US" style="color: #1e1e23; font-family: "arial" , "sans-serif"; font-size: 13.5pt;">While the possible long-term health effects of PFOA are not known, the issue is currently under study by the EPA and other agencies. In addition, in 2006, the EPA and the 8 manufacturers who used PFOA at the time agreed to a “stewardship program.” The goals were for the companies to reduce factory emissions and product content levels of PFOA by 95% by the year 2010, and to eliminate PFOA from emissions and product contents by the end of 2015. The companies have submitted annual reports on their progress to the EPA, and the latest reports indicated a large reduction in use of these chemicals. The decreasing demand for PFOA has also led to many companies phasing out production.<o:p></o:p></span></div>
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<span lang="EN-US" style="color: #1e1e23; font-family: "arial" , "sans-serif"; font-size: 13.5pt;">The EPA does not regulate the levels of PFOA or related chemicals (such as perfluorooctane sulfonate, or PFOS) in drinking water at this time. However, in 2009, the EPA released provisional health advisories (PHAs) for PFOA and PFOS in drinking water. These advisories recommend that actions should be taken to reduce exposure when contaminants go above a certain level in the drinking water – 0.4 µg/L (micrograms per liter) for <a href="http://www.ptfe-machinery.com/">PFOA</a> and 0.2 µg/L for PFOS. These advisories are not legally enforceable federal standards and are subject to change as new information becomes available.<o:p></o:p></span></div>
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<b><span lang="EN-US" style="color: #1e1e23; font-family: "arial" , "sans-serif"; font-size: 24pt;">Should I take measures to protect myself, such as not using my Teflon-coated pans?<o:p></o:p></span></b></div>
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<span lang="EN-US" style="color: #1e1e23; font-family: "arial" , "sans-serif"; font-size: 13.5pt;">Other than the possible risk of flu-like symptoms from breathing in fumes from an overheated Teflon-coated pan, there are no known risks to humans from using Teflon-coated cookware. While <a href="http://www.ptfe-machinery.com/">PFOA</a> is used in making Teflon, it is not present (or is present in extremely small amounts) in Teflon-coated products.<o:p></o:p></span></div>
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<span lang="EN-US" style="color: #1e1e23; font-family: "arial" , "sans-serif"; font-size: 13.5pt;">Because the routes by which people may be exposed to PFOA are not known, it is unclear what steps people might take to reduce their exposure. According to the US Centers for Disease Control and Prevention (CDC), people whose regular source of drinking water is found to have higher than normal levels of PFOA or similar chemicals might consider using bottled water or installing activated carbon water filters.<o:p></o:p></span></div>
<span lang="EN-US" style="color: #1e1e23; font-family: "arial" , "sans-serif"; font-size: 13.5pt;">For people who are concerned they might have been exposed to high levels of PFOA, blood levels can be measured, but this is not a routine test that can be done in a doctor’s office. Even if the test is done, it’s not clear what the results might mean in terms of possible health effects.</span><br />
<span lang="EN-US" style="color: #1e1e23; font-family: "arial" , "sans-serif"; font-size: 13.5pt;">Tags:teflon,teflon ptfe,PFOA</span>PTFE Machineryhttp://www.blogger.com/profile/11221386967155866041noreply@blogger.com0tag:blogger.com,1999:blog-8512558734070384940.post-32800718815574334052018-05-28T23:43:00.000-07:002018-05-28T23:43:03.987-07:00For Dummies 5 Questions and Answers about Polymer Bellows<div class="MsoNormal">
<span lang="EN-US" style="font-family: "times new roman" , "serif"; font-size: 15pt;">One of the primary uses of bellows is to absorb dimensional changes due to thermal effects, which is very useful when used high temperature flows such as steam. Bellows also serve to dampen vibration in the system caused by rotating components, protect sensitive and brittle processing equipment, and to absorb shock loadings.<o:p></o:p></span></div>
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<b><span lang="EN-US" style="font-family: "times new roman" , "serif"; font-size: 15pt;">Why is PTFE a popular choice for bellows?<o:p></o:p></span></b></div>
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<span lang="EN-US" style="font-family: "times new roman" , "serif"; font-size: 15pt;">PTFE (also known by its trade name <a href="http://www.ptfe-machinery.com/">Teflon</a>) is a popular choice for the bellows material. It is ideal for use in highly corrosive environmentssuch as those involving strong oxidizing and reducing accents, salts, high concentrations of acid, and chemically active organic compounds. It has an extremely long flex life (how many flexing cycles it can handle before it fails), and a very low spring rate (amount of force needed to flex the bellows) – which means that it can reliably handle the challenge of fluctuating and vibrational loadings.<o:p></o:p></span></div>
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<b><span lang="EN-US" style="font-family: "times new roman" , "serif"; font-size: 15pt;">What types of movements can bellows be used to absorb?<o:p></o:p></span></b></div>
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<span lang="EN-US" style="font-family: "times new roman" , "serif"; font-size: 15pt;">There are three types of movement that bellow expansion joints can absorb: axial deflection, lateral deflection, and angular deflection. Axial deflection includes compression and extension affects along the longitudinal axis of the bellows. Lateral deflection occurs when the end joints of the bellows displace relative to each other. Also known as parallel misalignment, this type of deflection can also be absorbed by a bellows expansion joint. Angular deflection can be described as a rotational displacement, or twisting displacement.<o:p></o:p></span></div>
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<b><span lang="EN-US" style="font-family: "times new roman" , "serif"; font-size: 15pt;">How does the number of convolutions affect bellow performance?<o:p></o:p></span></b></div>
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<span lang="EN-US" style="font-family: "times new roman" , "serif"; font-size: 15pt;">Recall that a convolution is the smallest flexible unit in a bellows. The general heuristic for bellow convolutions is this: fewer convolutions will give you better pressure and temperature ratings, BUT the amount of movement it can handle is more limited than bellows with more convolutions. More convolutions, on the other hand, can absorb more movement but at a cost in pressure/temperature ratings.<o:p></o:p></span></div>
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<b><span lang="EN-US" style="font-family: "times new roman" , "serif"; font-size: 15pt;">Are there other polymers used for bellows?<o:p></o:p></span></b></div>
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<span lang="EN-US" style="font-family: "times new roman" , "serif"; font-size: 15pt;">Yes, another polymer option for bellows is UHMW PE, ultra-high molecular weight polyethylene. While not as chemically resistant as PTFE, it currently has the highest impact strength of any polymer on the market today. If the bellows are used in connection with abrasive materials, UHMW PE would be a valid alternative to PTFE because it has better abrasion resistance.<o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "times new roman" , "serif"; font-size: 15pt;">PFA, or Perfluoroalkoxy or Teflon PFA, is similar to PTFE(<a href="http://www.ptfe-machinery.com/">teflon</a>) in many ways and is someone chosen in place of PTFE because it offers higher strength at extreme temperatures, even in the presence of extremely aggressive chemicals.<o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "times new roman" , "serif"; font-size: 15pt;">TFM, or PTFE-TFM, is a second-generation PTFE that has better fatigue properties than PTFE and offers better stress recovery. It is well adapted for situations that involve high temperatures and vacuum pressures.<o:p></o:p></span></div>
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<b><span lang="EN-US" style="font-family: "times new roman" , "serif"; font-size: 15pt;">Bellows Conclusion<o:p></o:p></span></b></div>
<span lang="EN-US" style="font-family: "times new roman" , "serif"; font-size: 15pt;">Bellows serve a variety of purposes – form absorbing displacement and shock to preventing sensitive equipment of a brittle nature. They can absorb axial, lateral, and angular displacements. The number of convolutions in a bellow is related to both its strength and pressure rating as well as the maximum amount of displacement it can absorb. Finally, polymers such as PTFE(<a href="http://www.ptfe-machinery.com/">teflon</a>), UHMW PE, PFA, and TFM are popular choices for bellows materials, although PTFE seems to remain the first choice for many engineers.</span><br />
<span lang="EN-US" style="font-family: "times new roman" , "serif"; font-size: 15pt;">Tags:teflon ptfe,teflon,bellows</span>PTFE Machineryhttp://www.blogger.com/profile/11221386967155866041noreply@blogger.com0tag:blogger.com,1999:blog-8512558734070384940.post-17819211186107572302018-05-27T23:57:00.000-07:002018-05-27T23:57:08.358-07:00Ball Valve Seals - 6 Key Materials You Should Know About<div align="left" class="MsoNormal" style="background: white; line-height: 24pt; vertical-align: baseline;">
<b><span lang="EN-US" style="font-family: "segoe ui" , "sans-serif"; font-size: 18pt;">Ball Valve Seals Material Choice<o:p></o:p></span></b></div>
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<span lang="EN-US" style="font-family: "times new roman" , "serif"; font-size: 15pt;">The choice of a seal material for a ball valve is vital to its successful operation. In this post, we are going to look at some of the major characteristics of six commonly used options for polymer seals in ball valves.<o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "times new roman" , "serif"; font-size: 15pt;">Here are some additional post on Polymer Seats and Sealing Solutions:<o:p></o:p></span></div>
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<li class="MsoNormal" style="background: white; mso-list: l0 level1 lfo1; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto; mso-pagination: widow-orphan; tab-stops: list 36.0pt; text-align: left; vertical-align: baseline;"><span lang="EN-US" style="font-family: "times new roman" , "serif"; font-size: 15pt;">Advanced EMC Technologies High Performance Sealing Solutions Guide<o:p></o:p></span></li>
<li class="MsoNormal" style="background: white; mso-list: l0 level1 lfo1; mso-margin-bottom-alt: auto; mso-margin-top-alt: auto; mso-pagination: widow-orphan; tab-stops: list 36.0pt; text-align: left; vertical-align: baseline;"><span lang="EN-US" style="font-family: "times new roman" , "serif"; font-size: 15pt;">PTFE Rotary Lip Seals - 6 Feature Competitors Don’t Want You to Know! <o:p></o:p></span></li>
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<b><span lang="EN-US" style="font-family: "segoe ui" , "sans-serif"; font-size: 15pt;">Key Material #1: <span style="color: windowtext; text-decoration-line: none;">Virgin PTFE</span> <o:p></o:p></span></b></div>
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<span lang="EN-US" style="font-family: "times new roman" , "serif"; font-size: 15pt;"><span style="color: windowtext; text-decoration: none; text-underline: none;">Virgin PTFE</span> (trade name Teflon) is ideal as a ball valve seal material for pressures less than 5 ksi and temperatures between -20 F and 400 F; however, its temperature performance does depend on pressure. Speaking of pressure, PTFE does not decompress well after being pressurized. Note that <a href="http://www.ptfe-machinery.com/">teflon</a> does not perform well when subjected to temperature fluctuations greater than 167 F. One of its greatest strengths is chemical resistance, being close to insoluble; another strength is extremely low friction. It is also fire resistant.<o:p></o:p></span></div>
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<b><span lang="EN-US" style="font-family: "segoe ui" , "sans-serif"; font-size: 15pt;">Key Material #2: <span style="color: windowtext; text-decoration: none; text-underline: none;">Glass Reinforced PTFE</span> <o:p></o:p></span></b></div>
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<span lang="EN-US" style="font-family: "times new roman" , "serif"; font-size: 15pt;"><span style="color: windowtext; text-decoration: none; text-underline: none;">Reinforced PTFE</span> as used in ball valve seals is typically 15% glass fiber, increasing the temperature and pressure rating available with virgin PTFE. Like unreinforced <a href="http://www.ptfe-machinery.com/">teflon</a>, glass reinforced PTFE still has very good chemical resistance with the exception of hot caustics and hydroflourics. It, too, is fire resistant and has low friction, though not as low as virgin PTFE. <o:p></o:p></span></div>
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<b><span lang="EN-US" style="font-family: "segoe ui" , "sans-serif"; font-size: 15pt;">Key Material #3: <span style="color: windowtext; text-decoration: none; text-underline: none;">Stainless Steel Reinforced PTFE</span><o:p></o:p></span></b></div>
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<span lang="EN-US" style="font-family: "times new roman" , "serif"; font-size: 15pt;">There is an alternate form of reinforced PTFE that is sometimes used in ball valve seals: <span style="color: windowtext; text-decoration: none; text-underline: none;">stainless steel reinforced PTFE</span>. This composite seal material is made of 50% <a href="http://www.ptfe-machinery.com/">teflon</a> and 50% powdered 316 stainless steel. Its temperature range is -20 F to 550 F (a bit higher than virgin PTFE) and it has higher pressure capabilities than either virgin or glass fiber reinforced PTFE. It, too, is fire resistant, however its coefficient of friction is higher than PTFE. <o:p></o:p></span></div>
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<b><span lang="EN-US" style="font-family: "segoe ui" , "sans-serif"; font-size: 15pt;">Key Material #4: <span style="color: windowtext; text-decoration: none; text-underline: none;">PEEK</span><o:p></o:p></span></b></div>
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<span lang="EN-US" style="font-family: "times new roman" , "serif"; font-size: 15pt;"><span style="color: windowtext; text-decoration: none; text-underline: none;">PEEK</span> is an option when the requirements lay outside the temperature range of PTFE. PEEK works well in environments with temperatures between -70 F to 600 F, and is unaffected by continuous exposure to steam and hot water. It is tougher than <a href="http://www.ptfe-machinery.com/">teflon</a>, but also harder. Its major drawback, besides its rigidity, is its brittle behavior at lower temperatures. <o:p></o:p></span></div>
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<b><span lang="EN-US" style="font-family: "segoe ui" , "sans-serif"; font-size: 15pt;">Key Material #5: <span style="color: windowtext; text-decoration: none; text-underline: none;">UMHW Polyethylene</span><o:p></o:p></span></b></div>
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<span lang="EN-US"><span style="font-family: "times new roman" , "serif"; font-size: 15pt;">UHMW Polyethylene</span><span style="border: 1pt none; color: #665ed0; font-family: "times new roman" , "serif"; font-size: 15pt; padding: 0cm;"> </span></span><span lang="EN-US" style="font-family: "times new roman" , "serif"; font-size: 15pt;">seems to be choice for more specialized applications, including those where there will be low to medium radiation exposure. Its pressure rating is 1.5 ksi and its temperature range is -70 F to 200 F 1500 psi -57C to 93C. UHMW Polyethylene also has very good abrasion resistance. <o:p></o:p></span></div>
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<b><span lang="EN-US" style="font-family: "segoe ui" , "sans-serif"; font-size: 15pt;">Key Material #6: <span style="color: windowtext; text-decoration: none; text-underline: none;">Chlorinated Polyether</span><o:p></o:p></span></b></div>
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<span lang="EN-US"><span style="font-family: "times new roman" , "serif"; font-size: 15pt;">Chlorinated polyether</span></span><span lang="EN-US" style="font-family: "times new roman" , "serif"; font-size: 15pt;"> is sometimes used as a ball valve seal material, functioning at temperatures up to 257 F. It functions well in the presence of acids and solvents if softening can be tolerated, and is resistant to more than 300 chemicals. It does not creep, and does not tend to absorb water.<o:p></o:p></span></div>
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<b><span lang="EN-US" style="border: 1pt none; font-family: "times new roman" , "serif"; font-size: 15pt; padding: 0cm;">Seals Continually Evolving:</span></b><span lang="EN-US" style="font-family: "times new roman" , "serif"; font-size: 15pt;"><o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "times new roman" , "serif"; font-size: 15pt;">Seal materials is a continually evolving field, but these six materials seem to be the leading contenders for thermoplastic <span style="color: windowtext; text-decoration: none; text-underline: none;">ball valve seal choices</span>. Their major characteristics seem to the pressure and temperature performance, low friction, chemical resistance.<o:p></o:p></span></div>
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<span style="font-family: "times new roman" , serif;"><span style="font-size: 20px;">Tags:teflon ptfe,uhmw,ball valve seals</span></span><br />
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PTFE Machineryhttp://www.blogger.com/profile/11221386967155866041noreply@blogger.com0tag:blogger.com,1999:blog-8512558734070384940.post-70316294576836754812018-05-24T23:37:00.000-07:002018-05-24T23:37:20.160-07:00Four Most Popular Rotary Shaft Seals Material Options and How They Compare<div class="MsoNormal">
<b><span lang="EN-US" style="font-size: 22pt;">Evolution of Seal Materials<o:p></o:p></span></b></div>
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<span lang="EN-US">The evolution of seal materials evolved as seals faced more rugged demands. Early needs could be met using packed hemp or leather, but as the demands became more and more rigorous new materials were sought. This led to the introduction of natural rubber seals, which evolved into synthetic elastomers, and finally engineering polymers like <a href="http://www.ptfe-machinery.com/">teflon</a> PTFE (Polytetrafluoroethylene).<o:p></o:p></span></div>
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<span lang="EN-US">Four of the most common modern material options for rotary shaft seal lips are nitrile rubber, polyacrylate, FKM, and PTFE. Of these materials, three are elastomers – nitrile rubber, polyacrylate rubber and FKM – and only one is polymer – PTFE. Let’s see how these materials stack up.<o:p></o:p></span></div>
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<span lang="EN-US" style="font-size: 22pt;"><b>Material 1: Nitrile Rubber</b><o:p></o:p></span></div>
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<span lang="EN-US">Nitrile rubber goes by quite a few names, including acrylonitrile butadiene rubber, Buna-N, and NBR. Basically it is a synthetic rubber elastomer that is highly resistant to some key chemicals like oils, lubricants, and fuels. Compared to other elastomers, it does an outstanding job of resisting degradation and exposure to the sun and weather. It has it limits, though.<o:p></o:p></span></div>
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<b><span lang="EN-US" style="font-size: 22pt;">Material 2: Polyacrylate Rubber<o:p></o:p></span></b></div>
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<span lang="EN-US">Polyacrylate refers to polyacrylate rubber and is sometimes referred to as ACM. It provides better heat resistance and is compatible with higher shaft speeds than nitrile rubber. It’s also quite good in some specialty applications such as lubricants that include sulfur. Its limited strength and water resistance are its major limiting characteristics.<o:p></o:p></span></div>
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<b><span lang="EN-US" style="font-size: 22pt;">Material 3: FKM (Fluoroelastomers)<o:p></o:p></span></b></div>
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<span lang="EN-US">Here’s an interesting fact: people often get confused about the difference between FKM, FPM, and Viton. They are all referring to the same base material. The name FKM finds its roots in ASTM classifications of flouroelastomers, while FPM is the DIN/ISO abbreviation. Viton is its trade name, owned by DuPont. The properties of FKM are far superior to that of either nitrile rubber or polyacrylate rubber, both in terms of temperature and shaft speed, but also chemical resistance. It’s also the most expensive of the three elastomers discussed so far.<o:p></o:p></span></div>
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<b><span lang="EN-US" style="font-size: 22pt;">Material 4: PTFE (Polytetrafluoroethylene)<o:p></o:p></span></b></div>
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<span lang="EN-US">PTFE is best known by its trade name, <a href="http://www.ptfe-machinery.com/">Teflon</a> (also owned by DuPont). <a href="http://www.ptfe-machinery.com/">teflon</a> far exceeds the performance of nitrile rubber, polyacrylate rubber, and FKM in terms of shaft speed, temperature, and chemical resistance. In fact, is has the best chemical resistance of any polymer or elastomer as well as the lowest coefficient of friction.<o:p></o:p></span></div>
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<span lang="EN-US" style="font-size: 22pt;">Conclusion<o:p></o:p></span></div>
<span lang="EN-US" style="font-family: "calibri" , sans-serif; font-size: 10.5pt;">The chart below shows how these four common seal materials stack up to each other in terms of their shaft speed limitations. PTFE outshines the rest, even at shaft speeds in excess of 30,000 rpm. When you are selecting a seal that needs to survive a corrosive and challenging environment at elevated speeds, look no further than PTFE.</span><br />
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<span lang="EN-US" style="font-family: "calibri" , sans-serif; font-size: 10.5pt;">Tags:teflon ptfe,teflon,seal</span>PTFE Machineryhttp://www.blogger.com/profile/11221386967155866041noreply@blogger.com0tag:blogger.com,1999:blog-8512558734070384940.post-19031133751383794202018-05-24T00:22:00.000-07:002018-05-24T00:22:03.127-07:00Teflon Is Forever<div align="center" class="MsoNormal" style="background: white; mso-margin-top-alt: auto; mso-outline-level: 3; mso-pagination: widow-orphan; text-align: center;">
<b><span lang="EN-US" style="font-family: Arial, sans-serif; font-size: 13.5pt;">For decades, DuPont has sold the answer to
crud, gunk, and grime. What the company didn’t advertise was that its nonstick
wonder sticks—to <i>us</i>.<o:p></o:p></span></b></div>
<div style="background: white;">
<span lang="EN-US" style="font-family: Georgia, serif; font-size: 13.5pt;">Congresswoman Pat Schroeder was
scrambling eggs, one day back in 1984, when she coined one of the most durable
political metaphors of our time. Her 1984 description of Ronald Reagan as “the
Teflon President” became instant vernacular, attaching itself to everyone from
“Teflon Tony” Blair to “Teflon Don” John Gotti.<o:p></o:p></span></div>
<div style="background: white;">
<span lang="EN-US" style="font-family: Georgia, serif; font-size: 13.5pt;">It is all the more ironic, then,
that our favorite metaphor for bad press that won’t stick comes from a product
whose toxic legacy will stick around forever. Teflon, it turns out, gets its
nonstick properties from a toxic, nearly indestructible chemical
called pfoa, or perfluorooctanoic acid. Used in thousands of products from
cookware to kids’ pajamas to takeout coffee cups, pfoa is a likely
human carcinogen, according to a science panel commissioned by the
Environmental Protection Agency. It shows up in dolphins off the Florida coast
and polar bears in the Arctic; it is present, according to a range of studies,
in the bloodstream of almost every American—and even in newborns (where it may
be associated with decreased birth weight and head circumference). The
nonprofit watchdog organization Environmental Working Group (ewg)
calls pfoa and its close chemical relatives “the most persistent
synthetic chemicals known to man.” And although DuPont, the nation’s sole
Teflon manufacturer, likes to chirp that its product makes “cleanup a breeze,”
it is now becoming apparent that cleansing ourselves of pfoa is
nearly impossible.<o:p></o:p></span></div>
<div style="background: white;">
<span lang="EN-US" style="font-family: Georgia, serif; font-size: 13.5pt;">DuPont has always known more about
<a href="http://www.ptfe-machinery.com/">Teflon</a> than it let on. Two years ago the epa fined the company $16.5
million—the largest administrative fine in the agency’s history—for covering up
decades’ worth of studies indicating that pfoacould cause health problems
such as cancer, birth defects, and liver damage. The company has faced a barrage
of lawsuits and embarrassing studies as well as an ongoing criminal probe from
the Department of Justice over its failure to report health problems among
Teflon workers. One lawsuit accuses DuPont of fouling drinking water systems
and contaminating its employees with pfoa. Yet it is still
manufacturing and using pfoa, and unless the epa chooses to
ban the chemical, DuPont will keep making it, unhindered, until 2015.<o:p></o:p></span></div>
<div style="background: white;">
<span lang="EN-US" style="font-family: Georgia, serif; font-size: 13.5pt;">The Teflon era began in 1938,
when a DuPont chemist experimenting with refrigerants stumbled upon what would
turn out to be, as the company later boasted, “one of the world’s slipperiest
substances.” DuPont registered the Teflon trademark in 1944, and the coating
was soon put to work in the Manhattan Project’s A-bomb effort. But like other
wartime innovations, such as nylon and pesticides, Teflon found its true
calling on the home front. By the 1960s, DuPont was producing Teflon for
cookware and advertising it as “a housewife’s best friend.” Today, DuPont’s
annual worldwide revenues from <a href="http://www.ptfe-machinery.com/">Teflon</a> and other products made
with pfoa as a processing agent account for a full $1 billion of the
company’s total revenues of $29 billion.<o:p></o:p></span></div>
<div style="background: white;">
<span lang="EN-US" style="font-family: Georgia, serif; font-size: 13.5pt;">Teflon is not actually the brand
name of a pan; it’s the name of the slippery stuff that DuPont sells to other
companies. Marketers deploy the trademark as a near-mystic incantation, a
mantra for warding off filth: Clorox Toilet Bowl Cleaner With Teflon® Surface
Protector, Dockers Stain Defender™ With Teflon®, Blue Dolphin Sleep ‘N Play
layette set “protected with Teflon fabric protector.” In one TV spot, an infant
cries until Dad sets him down on a Stainmaster (with Advanced Teflon® Repel
System) carpet, where baby, improbably, falls into blissful slumber.<o:p></o:p></span></div>
<div style="background: white;">
<span lang="EN-US" style="font-family: Georgia, serif; font-size: 13.5pt;">Breathing in dust from
Teflon-treated rugs or upholstery as they wear down is one way we may be
ingesting pfoa. Food is another: Pizza-slice paper, microwave-popcorn
bags, ice cream cartons, and other food packages are often lined with Zonyl,
another DuPont brand. Technically, Zonyl does not contain pfoa, but it is
made with fluorotelomer chemicals that break down into pfoa. Regardless of
how it gets into our bodies, once there, pfoa stays—quietly
accumulating in our tissues, for a lifetime.<o:p></o:p></span></div>
<div style="background: white;">
<span lang="EN-US" style="font-family: Georgia, serif; font-size: 13.5pt;">Teflon is not the only nonstick,
non-stain brand that has turned out to be stickier than advertised. Scotchgard
and Gore-Tex, to name just two, are also made with pfoa or other
perfluorochemicals (pfcs). Last year the epa hit the 3M corporation,
maker of Scotchgard, with a $1.5 million penalty for failing to report pfoa and pfc health
data. Chemicals similar to pfoa have recently turned up in water
supplies of suburban Minneapolis and St. Paul, near 3M facilities.<o:p></o:p></span></div>
<div style="background: white;">
<span lang="EN-US" style="font-family: Georgia, serif; font-size: 13.5pt;">Unlike DuPont, though, 3M no longer
sells pfoa: In the late 1990s, when testing blood samples for a health
study, the company found pfoa even in the “clean” samples from
various U.S. blood banks that it had planned to use as controls. “They realized
they were contaminating the entire population,” says Richard Wiles, the
Environmental Working Group’s executive director. In 2000, 3M announced that it
was discontinuing pfoa production.<o:p></o:p></span></div>
<div style="background: white;">
<span lang="EN-US" style="font-family: Georgia, serif; font-size: 13.5pt;">When 3M got out, DuPont, which until
then had bought its pfoa from 3M, jumped in. Now the company’s bottom
line depends on whether its product’s mythic reputation—Teflon’s own
Teflon—remains intact.<o:p></o:p></span></div>
<div style="background: white;">
<span lang="EN-US" style="font-family: Georgia, serif; font-size: 13.5pt;">So far, it seems to be holding.
Nonstick pots and pans account for 70 percent of all cookware sold. “Amazingly
enough, all the publicity has had no impact on sales,” says Hugh Rushing,
executive vice president of the Cookware Manufacturers’ Association. “People
read so much about the supposed dangers in the environment that they get a tin
ear about it”—though sales of cast-iron skillets, touted as a safer
alternative, have doubled in the last five years, in large part because of “the
Teflon issue,” according to cast-iron manufacturer Lodge.<o:p></o:p></span></div>
<div style="background: white;">
<span lang="EN-US" style="font-family: Georgia, serif; font-size: 13.5pt;">In fact, nonstick pans are not a
major source of exposure to pfoa, because almost all of the chemical is
burned off during manufacture. Still, when overheated, Teflon cookware can
release trace amounts of pfoa and 14 other gases and particles,
including some proven toxins and carcinogens, according to the Environmental
Working Group’s review of 16 research studies over some 50 years. At 500
degrees, Teflon fumes can kill birds; at 660, they can cause the flulike
“polymer fume fever” in humans. Even at normal cooking temperatures, two of
four brands of frying pans tested in a study cosponsored by DuPont gave off
trace amounts of gaseous pfoa and other perfluorated chemicals.<o:p></o:p></span></div>
<div style="background: white;">
<span lang="EN-US" style="font-family: Georgia, serif; font-size: 13.5pt;">A $5 billion multistate class-action
lawsuit representing millions of Teflon cookware owners alleges that DuPont has
known for years that its coatings could turn toxic at temperatures commonly
reached on the stove, but failed to tell consumers. DuPont’s website recommends
not heating Teflon above 500 degrees (so it doesn’t “discolor or lose its
nonstick quality”) and advises that when overheated, “nonstick cookware can
emit fumes that may be harmful to birds, as can any type of cookware preheated
with cooking oil, fats, margarine and butter.” But who knows how hot a pan
gets, and who looks out for birds before fixing dinner? Even while researching
this story, I left a nonstick skillet on the stove. The fumes smelled like
fried computer, and I vowed not to do it again. But I also decided to go with
the hazardous-waste flow, figuring, “We’re all toxic dumps anyway.”
(ewg studies have found a “body burden” of 455 industrial pollutants,
pesticides, and other chemicals in the bodies of ordinary Americans.) With
toxic substances unavoidable, or at least key to convenience, we run our own
self-interested cost-benefit analyses. I throw out the Teflon-coated Claiborne
pants my mother-in-law sent my son, but I let him play on swing sets made of
arsenic-treated wood because I don’t want to face a tantrum.<o:p></o:p></span></div>
<div style="background: white;">
<span lang="EN-US" style="font-family: Georgia, serif; font-size: 13.5pt;">Still, consumers of Teflon pans
and pants (not to mention the mascara, dental floss, and other personal care
products made slippery with a touch of Tef) have it relatively safe. The people
who make the stuff, and who live near the plants, face far worse dangers. The
granddaddy of trouble plants—and the one inspiring a range of lawsuits—is
DuPont’s plant near Parkersburg, West Virginia. Residents there have sued
DuPont for polluting their drinking water with pfoa, and in March 2005,
DuPont settled the case for $107 million. If an independent science panel finds
links between pfoa and various health problems, DuPont will have to
pay up to an additional $235 million to monitor the health of 70,000 people for
years to come. Meanwhile, as part of the court order, the company is supplying
the entire population of one nearby town with bottled drinking water.<o:p></o:p></span></div>
<div style="background: white;">
<span lang="EN-US" style="font-family: Georgia, serif; font-size: 13.5pt;">The epa’s $16.5 million fine
against DuPont for concealing evidence of health risks traces back to the same
Parkersburg plant. According to the epa, workers were reporting health
problems there for years, including birth defects in their children; as far
back as 1981, DuPont scientists knew that pfoa could cross the
placenta and thus contaminate fetuses. DuPont also knew that some of its
workers’ babies had been born with eye defects similar to those 3M had just
then reported in rats exposed to pfoa. At that point, rather than risk
finding more evidence, DuPont terminated its study and didn’t report the
troubling data to the epa as required by law. “Our interpretation of
the reporting requirements differed from the agency’s,” the company explained
in 2005.<o:p></o:p></span></div>
<div style="background: white;">
<span lang="EN-US" style="font-family: Georgia, serif; font-size: 13.5pt;">Today, DuPont remains adamant
that pfoa—whether in pots, pants, or drinking water—is no threat.
The epa may say studies show unequivocally that in “laboratory animals
exposed to high doses, pfoa causes liver cancer, reduced birth
weight, immune suppression and developmental problems,” but DuPont’s website
quotes Dr. Samuel M. Cohen of the University of Nebraska Medical Center, who
says, “We can be confident that pfoa does not pose a cancer risk to
humans at the low levels found in the general population.” But, notes Robert
Bilott, one of the lead attorneys in the Parkersburg suit, “the general
population isn’t drinking it. And they have five parts per billion in their
blood. Near the West Virginia plant, it’s in the hundreds of parts per billion;
and in the elderly and in children, several thousand parts per billion.”<o:p></o:p></span></div>
<div style="background: white;">
<span lang="EN-US" style="font-family: Georgia, serif; font-size: 13.5pt;">DuPont is hardly unique in trying to
cast unflattering data as incomplete or uncertain. As epidemiologist David
Michaels wrote in a 2005 essay in <i>Scientific American</i> titled
“Doubt Is Their Product,” many corporations have followed the tobacco (and more
recently, global warming) model of insisting that the scientific jury is still
out, “no matter how powerful the evidence.” Michaels took his title from a 1969
memo written by an executive for cigarette maker Brown & Williamson: “Doubt
is our product since it is the best means of competing with the ‘body of fact’
that exists in the mind of the general public.” Even the indoor tanning
industry, notes Michaels, “has been hard at work disparaging studies that have
linked ultraviolet exposure with skin cancer.”<o:p></o:p></span></div>
<div style="background: white;">
<span lang="EN-US" style="font-family: Georgia, serif; font-size: 13.5pt;">Chemical companies caught a break
with the passage of the 1976 Toxic Substances Control Act (which they helped
write), a measure so weak it doesn’t require industrial chemicals to be tested
for toxicity. Only toxic <em><span style="font-family: "Georgia","serif"; mso-bidi-font-family: 宋体;">effects,</span></em> often found after a product
has become ubiquitous in the environment and in people’s bodies, must be
reported—and even that rule, as DuPont discovered, can be broken with only a
minor hit to profits.<o:p></o:p></span></div>
<div style="background: white;">
<span lang="EN-US" style="font-family: Georgia, serif; font-size: 13.5pt;">In the case of pfoa, it was
left to the epa to finally investigate the risk to public health.
That assessment, begun in 2000, is expected to go on for years.
If pfoa is determined to be a proven (not merely likely) carcinogen,
says agency spokeswoman Enesta Jones, “this chemical could be banned.” It would
be one of the epa‘s very few outright bans since 1996, when it proscribed
ozone-depleting chlorofluorocarbons. DuPont was the world’s biggest producer of
those too.<o:p></o:p></span></div>
<div style="background: white;">
<span lang="EN-US" style="font-family: Georgia, serif; font-size: 13.5pt;">For now, DuPont is subject only to
the epa‘s voluntary “stewardship” program, under which it has agreed to
reduce pfoa emissions from products and factories by 95 percent by
2010 and 100 percent by 2015. DuPont says it is likely to meet those deadlines:
In February, the company announced it had found a new technology that reduces
by 97 percent the pfoa used in making <a href="http://www.ptfe-machinery.com/">Teflon</a> and other coatings, and
it has vowed to “eliminate the need to make, buy or use pfoa by
2015.”<o:p></o:p></span></div>
<div style="background: white;">
<span lang="EN-US" style="font-family: Georgia, serif; font-size: 13.5pt;">“It’s interesting how DuPont says
they’re going to eliminate the ‘need’ to make, buy, or use pfoa,” says
Rick Abraham, an environmental consultant for the United Steelworkers, which
represents workers at DuPont’s plants. “It’s a self-imposed need. They need it
to make money. Are they going to stockpile it, make as much as they can by
2015? Given DuPont’s history, that’s very possible. They need to make public a
time frame for annual production and have it subject to third-party
verification.” DuPont spokesman Dan Turner responds, “We’re going to eliminate
it, period.” As for time frames, he says, “I can’t get into specifics. I can
only say we’re moving as quickly as the technology allows.”<o:p></o:p></span></div>
<div style="background: white;">
<span lang="EN-US" style="font-family: Georgia, serif; font-size: 13.5pt;">Meanwhile, DuPont has been applying
a protective layer of PR to the problem. Last year, caught in a flurry of bad
publicity about fines and lawsuits, the company took out full-page newspaper
ads. One stated, “Teflon® Non-Stick Coating is Safe.” And, as if to flip the
bird at workers’ complaints, it ran an ad in <i>Working Woman</i> showing
a female factory worker and declaring: “DuPont employees use their skills and
talents to make lives better, safer and healthier.” This year, DuPont plans to
advertise its pfoa-lowering measures only in trade publications, perhaps
because it’s tricky to boast of reduced pfoa while also maintaining
that the chemical is harmless. “No one is better than DuPont at greenwashing,”
says Joe Drexler of the Steelworkers’ DuPont Accountability Project.<o:p></o:p></span></div>
<div style="background: white;">
<span lang="EN-US" style="font-family: Georgia, serif; font-size: 13.5pt;">Possibly. Recall DuPont’s 1990 “Ode
to Joy” commercial, in which seals clapped, penguins chirped, and whales leapt
to honor DuPont for using double-hull tankers to “safeguard the environment.”
The seals evidently didn’t realize that a law passed after the 1989 <i>Exxon
Valdez</i> oil spill required double-hull tankers. The penguins probably
didn’t connect the ice melting under their flippers with DuPont’s
chlorofluorocarbons either. The company fought against regulating them right up
until they were banned.<o:p></o:p></span></div>
<div style="background: white;">
<span lang="EN-US" style="font-family: Georgia, serif; font-size: 13.5pt;">It is in such ads that corporate
fantasies and our individual ones meet and agree to ignore unpleasantries.
Corporations lie to us, sure, but we make it easy for them with the little lies
we tell ourselves. Especially when it comes to our everyday conveniences, it’s
easier to accept the company line that there is no risk than it is to accept
that authorities won’t necessarily protect us from risk. Jim Rowe, president of
the union local at DuPont’s Chambers Works plants in New Jersey, told me that
despite the science about birth defects among DuPont employees, many of his
coworkers have convinced themselves that there’s nothing to worry about: “When
we took blood tests and interviewed them, they said they were told ‘pfoa‘s not
a problem—it’s even in polar bears.'” Precisely. And even if DuPont (and
companies that make pfoa in Europe and Asia) stopped producing and
using the chemical tomorrow, the millions of pounds of it already on earth
would remain in the environment and in our bodies “forever,” says
the ewg‘s Wiles. “By that we mean infinity.”<o:p></o:p></span></div>
<div style="background: white;">
<span lang="EN-US" style="font-family: Georgia, serif; font-size: 13.5pt;">Denial, avoidance, and magical
thinking aren’t new. Like <a href="http://www.ptfe-machinery.com/">Teflon</a>, they’re barriers that keep unpleasant things
at bay, and like Teflon, they’re entrenched deep inside us.<o:p></o:p></span></div>
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Tags:teflon ptfe,teflon</div>
PTFE Machineryhttp://www.blogger.com/profile/11221386967155866041noreply@blogger.com0tag:blogger.com,1999:blog-8512558734070384940.post-79890989083289681262018-05-22T23:53:00.000-07:002018-05-22T23:53:10.281-07:00PTFE WIRE APPLICATIONS<div align="left" class="MsoNormal" style="margin: 7.5pt 0cm 11.25pt;">
<span lang="EN-US" style="color: #5a5a5a; font-family: "helvetica" , serif; font-size: 16.0pt;">PTFE APPLICATIONS<o:p></o:p></span></div>
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<span lang="EN-US" style="color: #5a5a5a; font-family: "helvetica" , serif; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">PTFE’s significant chemical, temperature, moisture, and
electrical resistances make it an ideal material whenever products, tools, and components
need to be durable and reliable in even the most strenuous applications. On top
of this, <a href="http://www.ptfe-machinery.com/">teflon</a> coated wire boasts unique low-
temperature durability and fire
resistance that make it a good choice for a constantly growing list of
products, components, and applications.<o:p></o:p></span></div>
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<span lang="EN-US" style="color: #5a5a5a; font-family: "helvetica" , serif; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">These qualities have allowed PWI to provide insulated
PTFE wire for an extensive range of high tech industries across the country.
While PTFE coated wire is often referred to by it's most popular brand-name,
Phoenix Wire has made it our specialty to start where most other companies
stop, and provide PTFE insulated wire not only in all standard sizes, but in a
range of micro and miniature sizes that continue to enable innovation in even
the most advanced industries.<o:p></o:p></span></div>
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<span lang="EN-US" style="color: #5a5a5a; font-family: "helvetica" , serif; font-size: 13.5pt;">Coated
Wire for
Medical Applications<o:p></o:p></span></div>
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<span lang="EN-US" style="color: #5a5a5a; font-family: "helvetica" , serif; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">PTFE coated wires provide ideal coverage and protection
when medical devices require a smooth coatings that’s thin, smooth, precise,
chemically inert, and capable of withstanding a wide variety of conditions.
It’s non-flaking finish makes it a coating of choice when finish quality is
paramount for both aesthetics and regulatory specifications. At PWI, our
specialty is insulating the kind of micro PTFE coated wire that is frequently
used in medical instrumentation, implants, and other devices.<o:p></o:p></span></div>
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<span lang="EN-US" style="color: #5a5a5a; font-family: "helvetica" , serif; font-size: 13.5pt;">PTFE
Insulated
Wire for Automotive Applications<o:p></o:p></span></div>
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<span lang="EN-US" style="color: #5a5a5a; font-family: "helvetica" , serif; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">The electrical demands placed on wiring in automotive
applications continue to demand more. With the presence of corrosive chemicals,
extreme temperatures, and friction - durable automotive wiring is relied on for
a growing list of applications including air conditioning systems,
navigation,power steering,battery applications, heated seats, and
more.<o:p></o:p></span></div>
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<span lang="EN-US" style="color: #5a5a5a; font-family: "helvetica" , serif; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">With micro miniature <a href="http://www.ptfe-machinery.com/">teflon</a> coated automotive
wires, PWI
gives automotive manufacturers the ability to continually innovate with wiring
that meets their exact performance specifications, no matter how limited they
may be on space.</span></div>
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<span lang="EN-US" style="color: #5a5a5a; font-family: "helvetica" , serif; font-size: 13.5pt;">PTFE
Coated
Cable and Wire for Oil and Gas Applications<o:p></o:p></span></div>
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<span lang="EN-US" style="color: #5a5a5a; font-family: "helvetica" , serif; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">One of the greatest engineering challenges for the Oil
and Gas industry is the ability to protect important instrumentation from
temperature extremes, corrosive chemicals, and pressure. Fortunately, the low
footprint and outstanding qualities of PTFE have allowed PWI to address the oil
and gas industry’s complex wiring needs for drilling operations and
instrumentation in even the toughest conditions.<o:p></o:p></span></div>
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<span lang="EN-US" style="color: #5a5a5a; font-family: "helvetica" , serif; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">On top of insulation, <a href="http://www.ptfe-machinery.com/">teflon</a> coated wires not
only offer
the electrical, temperature, and corrosion resistance needed by the gas and oil
industries, but they also provide essential protection against the gas
diffusion, pressure, and corrosion typically encountered in downhole
drilling.<o:p></o:p></span></div>
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<span lang="EN-US" style="color: #5a5a5a; font-family: "helvetica" , serif; font-size: 13.5pt;">PTFE
Coated
Wires for General Electrical Applications<o:p></o:p></span></div>
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<span lang="EN-US" style="color: #5a5a5a; font-family: "helvetica" , serif; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">As one of the best known insulators, PTFE is frequently
used in electrical components around the world for its ability to insulate to
500 volts per mil with unyielding reliability in even the most strenuous
applications.<o:p></o:p></span></div>
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<span lang="EN-US" style="color: #5a5a5a; font-family: "helvetica" , serif; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">From mobile devices to advanced, high-tech machinery --
PTFE coated wires can be found in virtually every industry. It is often used as
wire and cable wrap, as a separator on the conductive surfaces in capacitors,
and in a limitless range of electrical applications where components are
expected to withstand the elements.<o:p></o:p></span></div>
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<span lang="EN-US" style="color: #5a5a5a; font-family: "helvetica" , serif; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: 宋体; mso-font-kerning: 0pt;">With modern electronic manufacturers continually creating
smaller, more portable advanced electronics, a cost efficient and reliable
source for <a href="http://www.ptfe-machinery.com/">teflon</a> coated wire has never been more
important.<o:p></o:p></span></div>
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<span lang="EN-US" style="color: #5a5a5a; font-family: "helvetica" , serif; font-size: 13.5pt;">Other
Applications for PTFE Insulated Wire<o:p></o:p></span></div>
<span lang="EN-US" style="color: #5a5a5a; font-family: "helvetica" , serif; font-size: 10.5pt;">The qualities
of PTFE
lend our products to an almost infinite list of uses. Other industries and
applications PWI works with include retail, computers, veterinary medicine, the
food industry, communications, the art community, robotics, marine sciences,
space exploration, bioengineering, chemical sciences, and more.</span><br />
<span lang="EN-US" style="color: #5a5a5a; font-family: "helvetica" , serif; font-size: 10.5pt;"><br /></span>
<span lang="EN-US" style="color: #5a5a5a; font-family: "helvetica" , serif; font-size: 10.5pt;">Tags:teflon,teflon ptfe,teflon wire</span>PTFE Machineryhttp://www.blogger.com/profile/11221386967155866041noreply@blogger.com0tag:blogger.com,1999:blog-8512558734070384940.post-33348262448441743792018-05-20T23:36:00.001-07:002018-05-20T23:36:32.553-07:00PFA and TFM PTFE Excellent Material Choice for Bellows and Diaphragms<div align="left" class="MsoNormal" style="background: white; line-height: 24pt; vertical-align: baseline;">
<span lang="EN-US" style="font-family: "times new roman" , serif; font-size: 15pt;"><b>Polymer Bellows and Diaphragms</b><o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "times new roman" , serif; font-size: 15pt;"><span style="color: windowtext;">PTFE</span> (polytetrafluoroethylene), aka Teflon, is typically the first choice polymer for bellows and diaphragms, but did you know that <a href="http://ptfe-machinery.com/">PTFE</a> isn’t the only polymer you can choose from? In this article we are going to compare two other polymers – PFA and TFM – to PTFE as a material choice for bellows and diaphragms. <o:p></o:p></span></div>
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<b style="font-family: "Times New Roman", serif; font-size: 15pt;">PFA</b></div>
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<span lang="EN-US" style="font-family: "times new roman" , serif; font-size: 15pt;">PFA, or <span style="color: windowtext;">Perfluoroalkoxy</span>, is sometimes referred to as Teflon PFA. It has properties that are similar to PTFE, including outstanding chemical resistivity and has extremely low gas permeability. It is not hydrophobic like PTFE, however, and absorbs slightly more water. One reason it might be chosen over PTFE is its ability to maintain its mechanical strength at high temperatures, even when combined with caustic chemicals. It also possesses both excellent creep, fatigue properties and thermal stability. Its maximum continuous service in temperature is 260°C.<o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "times new roman" , serif; font-size: 15pt;">PFA is also more versatile when it comes to how parts can be manufactured; for example, it lends itself well to extrusion, injection molding, transfer molding, blow molding, and compression molding. You will often see PFA used for plastic lab equipment because of its outstanding chemical inertness, and its flexibility had made it a popular choice for tubing in many chemical applications. It’s also popular for semiconductor and pharmaceutical applications.<o:p></o:p></span></div>
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<b style="font-family: "Times New Roman", serif; font-size: 15pt;">TFM</b></div>
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<span lang="EN-US" style="font-family: "times new roman" , serif; font-size: 15pt;">You may have heard of <a href="http://ptfe-machinery.com/">TFM</a>, or PTFE-TFM. TFM is a second generation PTFE that includes an additional modifier called <span style="color: windowtext;">Perfluoro(propyl vinyl ether)</span>. This modifier makes its polymer structure denser than PTFE, lowering its gas permeability below that of PTFE but not quite as low as PFA. The same wall thickness of TFM has twice the barrier effect as PTFE. Its water absorption is comparable to that of PTFE, which is very good. Like PFA, it performs well at high temperatures and is very chemically inert. TFM is also well adapted to applications that combine high temperatures with vacuums. Like PFA, it works well for pharmaceutical and semiconductor applications.<o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "times new roman" , serif; font-size: 15pt;">Compared to PTFE, it has an even better surface characteristics, is stiffer, and is less susceptible to creep and has improved fatigue properties. Compared to PTFE, it also exhibits better stress recovery. Its maximum continuous service temperature is 250°C, which is slightly below PFA. <o:p></o:p></span></div>
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<b style="font-family: "Times New Roman", serif; font-size: 15pt;">Polymer Options</b></div>
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<span lang="EN-US" style="font-family: "times new roman" , serif; font-size: 15pt;">Both of these polymer options are excellent choices for high purity applications, including medical, pharma, semiconductor bellows. So, the next time you are selecting polymer bellows or diaphragm, don’t forget that <a href="http://ptfe-machinery.com/">PTFE</a> isn’t your only material option.<o:p></o:p></span></div>
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Tags:<span style="background-color: white; font-family: "times new roman" , serif; font-size: 20px;">Polymer Bellows,</span><span style="background-color: white; font-family: "times new roman" , serif; font-size: 20px;">Diaphragms</span></div>
PTFE Machineryhttp://www.blogger.com/profile/11221386967155866041noreply@blogger.com0tag:blogger.com,1999:blog-8512558734070384940.post-53071899717349841992018-05-18T01:38:00.000-07:002018-05-18T01:38:51.080-07:006 Key Reasons PEEK Works Well for High-Performance Bushings<div align="left" class="MsoNormal" style="background: white; vertical-align: baseline;">
<span lang="EN-US" style="font-family: "times new roman" , "serif"; font-size: 15.0pt;">PEEK, which stands for
polyetheretherketone, is a well-known engineering thermoplastic. It
has become a popular choice for bushings that must operate in demanding
high-speed, high-temperature environments.<o:p></o:p></span></div>
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<span lang="EN-US" style="font-family: "times new roman" , "serif"; font-size: 15.0pt;">In this post, we will
look at 6 reasons why PEEK actually works well in such hostile
environments.<o:p></o:p></span></div>
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<br /></div>
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<b><span lang="EN-US" style="font-family: "segoe ui" , "sans-serif"; font-size: 18.0pt;">1. PEEK Can Take the Heat<o:p></o:p></span></b></div>
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<span lang="EN-US" style="font-family: "times new roman" , "serif"; font-size: 15.0pt;"><a href="http://ptfe-machinery.com/">PEEK</a> bushings can operate
continuously in temperatures up to 480°F without loss of their key tensile
and flexural properties. In addition, when exposed to flames, PEEK bushings
exhibit low smoke and have a very low toxicity rating, and it even has a
V-0 flammability rating.<br />
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<b><span lang="EN-US" style="font-family: "segoe ui" , "sans-serif"; font-size: 18.0pt;">2. PEEK Has Good Chemical Resistance<o:p></o:p></span></b></div>
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<span lang="EN-US" style="font-family: "times new roman" , "serif"; font-size: 15.0pt;">PEEK has very good resistance
to a variety of aggressive chemicals and is also compatible for use
with steam and hot water. It is inert to common solvents and can resist
many chemicals, both organic and inorganic.<br />
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<b><span lang="EN-US" style="font-family: "segoe ui" , "sans-serif"; font-size: 18.0pt;">3. PEEK Is a Good Replacement for Metals<o:p></o:p></span></b></div>
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<span lang="EN-US" style="font-family: "times new roman" , "serif"; font-size: 15.0pt;">PEEK an excellent replacement
option for metal bushings because of its chemical resistance,
strength properties, and the fact that it is up to 70% lighter than the
metal parts it can replace. In fact, it’s light weight has made it a
popular choice for aerospace applications, where weight and fuels savings are
key design factors.<br />
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<b><span lang="EN-US" style="font-family: "segoe ui" , "sans-serif"; font-size: 18.0pt;">4. PEEK Has High Strength<o:p></o:p></span></b></div>
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<span lang="EN-US" style="font-family: "times new roman" , "serif"; font-size: 15.0pt;">PEEK is considered the
high-strength alternative when it comes to hostile environments where
other polymer bushings simply can’t perform. It’s high tensile strength
and impact strength make it an excellent choice for aggressive <a href="http://ptfe-machinery.com/">applications</a>.<br />
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<b><span lang="EN-US" style="font-family: "segoe ui" , "sans-serif"; font-size: 18.0pt;">5. PEEK Is Durable<o:p></o:p></span></b></div>
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<span lang="EN-US" style="font-family: "times new roman" , "serif"; font-size: 15.0pt;">Another key benefit of PEEK
bushings is their durability and excellent fatigue life. In fact, some
<a href="http://ptfe-machinery.com/">PEEK parts </a>have been shown to exhibit up to 100 times better fatigue
performance than their metal counterparts.<br />
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<b><span lang="EN-US" style="font-family: "segoe ui" , "sans-serif"; font-size: 18.0pt;">6. PEEK Can Be Improved by Additives<o:p></o:p></span></b></div>
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<span lang="EN-US" style="font-family: "times new roman" , "serif"; font-size: 15.0pt;">There are a variety of
additives that can further enhance PEEK’s already outstanding
properties, including glass and carbon fiber. Carbon and glass can enhance
PEEK’s tensile, compressive, and flexural strength, reduces its
coefficient of thermal expansion, increase its thermal conductivity,
slightly increase its hardness, and significantly increase its deflection
temperature.<br />
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<b><span lang="EN-US" style="font-family: "segoe ui" , "sans-serif"; font-size: 18.0pt;">Conclusion<o:p></o:p></span></b></div>
<span lang="EN-US" style="font-family: "times new roman" , "serif"; font-size: 15.0pt;">The combined strength,
thermal, and chemical properties of polyetheretherketone make it an
excellent choice for high temperature, environments in need of bushings.
Add to that its ability to serve as an excellent replacement for metal
bushings, and its ability to have its properties further enhanced by additives
like glass and carbon, and <a href="http://ptfe-machinery.com/">PEEK </a>quickly stands out as a top choice for high-performance
polymer bushings.</span><br />
<span lang="EN-US" style="font-family: "times new roman" , "serif"; font-size: 15.0pt;"><br /></span>
<span lang="EN-US" style="font-family: "times new roman" , "serif"; font-size: 15.0pt;">Tags:PEEK,High-Performance Bushings</span>PTFE Machineryhttp://www.blogger.com/profile/11221386967155866041noreply@blogger.com0tag:blogger.com,1999:blog-8512558734070384940.post-9901207042430507002018-05-15T23:29:00.002-07:002018-05-15T23:29:35.768-07:00Five Ways that PTFE Rotary Seals Differ from ElaomstericSeals<b>The PTFE Rotary Seal Difference </b><br />
<br />
<a href="http://ptfe-machinery.com/">PTFE rotary seals</a><span id="goog_1455427449"></span><span id="goog_1455427450"></span><a href="https://www.blogger.com/"></a> are often the answer when elastomeric seals just can’t handle the demands. In this article we are going to look at just five ways that PTFE seals differ in performance and behavior from elastomeric seals.<br />
<br />
Here are some additional blog posts from the Advanced EMC Technologies Blog:<br />
<br />
•Out of Whack: Eccentricity and Runout in PTFE Rotary Seals<br />
<br />
•PTFE Rotary Lip Seals - 6 Feature Competitors Don't Want You to Know!<br />
<br />
•Rotary Seals for Dummies: Four Questions about Shaft Surfaces for PTFE Rotary Seals<br />
<br />
<b>Low Friction</b><br />
<br />
Because of the incredibly low coefficient of friction that PTFE has, it can be used in applications where lubricant cannot be used. This is referred to as “dry running,” and <a href="http://ptfe-machinery.com/">PTFE seals</a> excel in these types of applications where elastomeric seals fail.<br />
<br />
<b>Speed</b><br />
<br />
Because of the low friction and excellent wear capabilities of PTFE, most PTFE seals can withstand running speeds of up to 5,900 feet per minute, or 30 m/s. This makes them ideal for speed-intensive applications where reliable sealing is vital.<br />
<br />
<b>Chemical Compatibility and FDA Approval</b><br />
<br />
PTFE is known for its incredible compatibility with a variety of chemicals, which sets it apart from the elastomeric materials typically used in sealing applications. Many PTFE compounds already FDA approval and are commonly used in pharmaceutical, food, and dairy applications<br />
.<br />
<b>Operating Temperatures</b><br />
<br />
Another benefit of PTFE rotary seals over traditional elastomeric rotary seals is the temperature range over which they can operate. Most PTFE seals can perform in the cryogenic temperatures all the way down to -95°F up and up to extremely high temperatures of 480°F.<br />
<br />
<b>Relationship between Speed and Friction</b><br />
<br />
The hydrodynamic film all the separates the seal lip from the movie.How much friction exists between the seal and the sealing surface is a function of the thickness of the hydrodynamic film. The film pulled into the gap between the seal and the surface by viscous drag. When the shaft is at rest, this layer will be at its minimum thickness and a certain amount of torque will be required to overcome the initial resistance to motion. Friction decreases as the velocity increases up to a point; after that speed is reached, friction will again begin to rise and the seal may begin to experience wear. However, PTFE has a very low coefficient of friction to begin with, and may often be an exception to this rule.<br />
<br />
<b>PTFE Seals Alternative</b><br />
<br />
The next time you are choosing a <a href="http://ptfe-machinery.com/">dynamic seal </a>for an application that involves high speeds, extreme temperatures, a need for low friction, FDA approval, or chemical resistance, don't forget to look into<a href="http://ptfe-machinery.com/">PTFE seals</a> as an alternative to the traditional elastomeric dynamic seals.<br />
For more detailed information on PTFE Rotary Shaft Seals download Advanced EMC Technologies resource guide.<br />
<br />
Tags:rotary seal,ElaomstericSeals,ptfe
PTFE Machineryhttp://www.blogger.com/profile/11221386967155866041noreply@blogger.com0tag:blogger.com,1999:blog-8512558734070384940.post-53841960744846356362018-05-13T19:21:00.002-07:002018-05-13T19:21:37.789-07:00Custom Spring Energized PTFE Seals for Medical DevicesThe medical device industry faces continually evolving challenges when it comes to finding the right sealing solutions for new and <a href="http://ptfe-machinery.com/">improved</a> designs. Issues such as sterilization, wide ranges of expected pressure, potentially aggressive environments, and FDA and USP approval make the design and specification process quite challenging. In this article, we are going to look at custom spring energized PTFE seals as a potential solution for sealing challenges in the medical industry.<br />
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<b>Why PTFE Seals?</b><br />
<a href="http://ptfe-machinery.com/">PTFE</a> is a popular choice for spring energized seals for medical applications for several reasons. One is the fact that certain grades of PTFE have been approved by the FDA as USP Class VImaterials. It is resistant to a variety of aggressive chemicals, has extremely low friction, and retains its key characteristics – including strength – over a wide range of temperatures and pressures. It can be sterilized using methods such as steam and EtO (ethylene oxide), and is both <a href="http://ptfe-machinery.com/">hydrophobic</a> and<a href="http://ptfe-machinery.com/"> oleophobic</a>.<br />
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<b>Why Spring Energized Seals?</b><br />
As you probably already know, spring energized seals are able to achieve a seal at low pressures because the spring applies outward pressure to the lip of the seal against the shaft or bore. As pressures increase, the pressure itself takes over from the energizing spring and achieves a tight seal. The result is an effective sealing solution.<br />
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Where Are Energized <a href="http://ptfe-machinery.com/">PTFE Seals</a> Used in the Medical Device Industry?<br />
PTFE seals are a common sight in the medical device industry, found in everything from dialysis equipment and infusion pumps to oxygen therapy, implanted electronic devices, trochars, and IV systems. Spring-energized PTFE seals are used in medical instruments, drug delivery systems, and orthopedic applications, just to name a few.<br />
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<b>Custom Seals</b><br />
Custom seal designs are available to meet the complex needs of the medical device industry. This includes custom engineering of the polymer (including fillers), unusual sizes or geometries, special spring materials, and more. In addition, PTFE lends itself to manufacturing processes such as machining that offer a high degree of accuracy and precision.<br />
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<b>Conclusion</b><br />
PTFE seals are popular in the <a href="http://ptfe-machinery.com/">medical device</a> industry for a variety of reasons, including their low friction, chemical resistance, and excellent performance in a variety of pressure, temperature, and speed situations. Spring-energized PTFE seals provide a reliable sealing solution that is effective even in low-pressure environments. Even if an off-the-shelf energized PTFE seal won’t meet your needs, you can look into a custom-designed energized Teflon seal tailored to your requirements and specifications.<br />
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Tags:seal,custom,ptfe,medicalPTFE Machineryhttp://www.blogger.com/profile/11221386967155866041noreply@blogger.com0tag:blogger.com,1999:blog-8512558734070384940.post-32597931417798691732018-05-07T23:33:00.000-07:002018-05-07T23:33:02.102-07:00Comparison Between PTFE and PFA ProcessingFor a number of years fluoropolymers have played a significant role in the chemical and similar industries to protect plants and equipment against chemical attack by a broad range of aggressive media. This is because they offer substantially better chemical resistance and thermal stability than other plastics or elastomeric materials.<br />
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Following the development of PTFE, the introduction of melt-processable <a href="http://www.ptfe-machinery.com/">fluorinated ethylene-propylene</a> (FEP) in 1960 opened up entirely new application areas. PFA, a perfluoro-alkoxy polymer which has been in successful use for 20 years as a lining material, is now a thermoplastic successor to PTFE, with equivalent thermal and chemical resistance and superior properties with respect to processability, translucency, permeation resistance and mechanical strength.<br />
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In the chemical industry, both fluoropolymers - PTFE and PFA - are used mainly in the form of linings (fig. 1, 2). For simple shapes, such as pipes, bends, T-pieces or reduction joints, PTFE is generally used; it is applied by means of paste extrusion, ram extrusion or tape wind-ing (fig. 3). In these processes a pre-form is made of the PTFE; this is then sintered and inserted into the metal workpiece. Using PTFE for lining of metal parts of complicated shape, such as valves and pumps, is more difficult. Isostatic molding is then the preferred method. In this PTFE powder is filled into the space created between the metal work-piece and a rubber bag which is specially made to fit into the shape of the area to be lined. The powder is pre-compressed, then cold-pressed into the desired shape. Finally, the rubber bag is removed and the lined part is sintered in an oven at over 360?C (680?F).<br />
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PFA, a thermoplastic material with a well-defined melting point, can be processed by means of transfer molding or injection molding. The granulate is melted in a melt pot or in the extruder and then forced into the hot tool by a hydraulic press.<br />
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This method enables very precise wall-thicknesses to be achieved, with tolerances of ? 0,5 mm, even at tight radii and in undercuts. Practically no mechanical finishing is needed, except to remove the sprue and to smooth the mating faces of flanges.<br />
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When using isostatic molding, however, a considerable amount of mechanical finishing is needed - depending on the degree of complication of the shape to be filled - to achieve the desired dimensions with precision.<br />
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The evenness of the wall-thickness may vary more, especially in the case of more complicated shapes such as valve housings.<br />
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<b>Absorption and Permeation</b></div>
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Unlike metals, plastics and elastomers absorb varying amounts of the media with which they come in contact. This is often the case with organic compounds. Absorption may be followed by permeation through the wall lining. Though this is rarely observed with fluoropolymers, it can be counteracted by an increased wall-thickness or by installing devices to exhaust the space between the <a href="http://www.ptfe-machinery.com/">fluoropolymer lining</a> and the metal wall. It has been clearly shown that in respect of permeation and absorption, melt-processed fluoropolymers such as PFA show better barrier properties than PTFE.</div>
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<b>Vacuum Resistance</b></div>
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Vacuum resistance is needed because, in closed systems of the kind widely used in chemical processing, a drop in temperature creates a vacuum in the system, unless it is already operating below <a href="http://www.ptfe-machinery.com/">atmospheric pressure</a>. When using PFA it is relatively simple to achieve adequate vacuum resistance for the lining. Usually the lining is ?anchored? to the metal wall by means of ?dove-tail? grooves or channels in the</div>
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latter.</div>
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With PTFE granulate that has been cold- formed, it is more difficult to achieve a sound anchoring of the lining in the metal wall as relatively large channels would be needed in order to allow the PTFE powder to flow into the grooves. More typically, therefore, bonding agents are used between the PTFE lining and the metal housing. However, due to the anti-adhesive characteristics of fluoropolymers and the limited thermal resistance of the bonding agents, PTFE shows only limited vacuum resistance.</div>
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<b>Quality Control prevents Cracks and Voids</b></div>
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With PTFE and PFA linings, the dielectric strength is measured in order to identify faults. This method reliably pinpoints cracks and voids which go all the way through the material but, due to the well-known high resistivity of fluoropolymers, it does not indicate any faults which start 1,5 mm or more under the surface (fig. 5).</div>
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For this reason further tests using ultrasonic methods can also be applied. This test measures the distance from the surface of the lining to the metal housing. However, it is unreliable because it does not provide the true lining thickness when a void or porosity is present. In addition, this method is impractical to employ on small parts or small complicated shapes with undercuts and tight radii.</div>
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Another method to check for surface defects such as cracks and voids is with the so called ?Met-L-Check? dye penetrant method. But this method is limited to detecting surface defects only.</div>
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<b><span lang="EN-US" style="font-family: "arial" , "sans-serif"; font-size: 10.0pt;">Chemical Structure</span></b></div>
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PFA, which is translucent, can reliably be checked optically. Cracks and voids under the surface can be made visible with suitable light sources. Hardly accessible locations in the lining can be examined using cold light lamps and flexible fibre light guides.</div>
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<b>Cost Comparisons for Linings</b></div>
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In terms of raw material prices, PFA costs roughly three times as much as PTFE.</div>
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This disadvantage can, however, be compensated or greatly reduced, as a function of factors such as the shape to be lined, its size, the number of workpieces to be lined and the processing method adopted. This is possible because PFA neither requires manual process preparation nor finish machining with corresponding material losses.</div>
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The use of <a href="http://www.ptfe-machinery.com/">PFA</a> for lining very large parts is not recommended, because the high material cost would make the part too expensive. Another point to be kept in mind is the cost of tools, which are not amortized</div>
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when only small numbers of parts are to be lined. Furthermore, there are practical limits to the weight of injected material that molding machines are capable of handling.</div>
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<b>Conclusions</b></div>
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More than 20 years of experience with linings for various parts, e.g. valve and pump housings, have shown that <a href="http://ptfe-machinery.com/">PFA</a> has numerous advantages when high thermal and chemical resistance are the main requirements.</div>
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The accurate and even wall-thickness that can be achieved with PFA is a major advantage, especially when working with media which have a strong tendency to diffuse.</div>
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Practical experience has also shown that PFA gives better barrier properties than PTFE.</div>
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Bromine manufacturers report, for example, that the penetration depth of bromine in PFA is about one third less than in PTFE, when operating conditions such as time, temperature and pressure are the same.</div>
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PTFE, on the other hand, is still widely used for components of chem- ical valves and other chemical processing equipment where flex fatigue resistance is required.</div>
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Typical examples of such applications are bellows, as well as diaphragms in valves and pumps.</div>
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For seat rings, plugs, seals and similar parts, PTFE is a suitable and economical material.</div>
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A recent trend for parts such as these is to use modified PTFE, as its dimensional stability and hardness are superior to those of standard PTFE.</div>
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<span lang="EN-US">Tags:PTFE,PFA,PTFE vs PFA</span></div>
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PTFE Machineryhttp://www.blogger.com/profile/11221386967155866041noreply@blogger.com0tag:blogger.com,1999:blog-8512558734070384940.post-27493320417076689382018-05-06T23:06:00.001-07:002018-05-06T23:06:43.452-07:00Why use a PTFE (Polytetrafluoroethylene) instead of Rubber in a Rotary Shaft Seal?<b>PTFE Rotary Shaft Seals Outperform Rubber Shaft Seals</b><br />
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Elastomeric seals performed well for many years, but as the applications and environments became more demanding, elastomers had a hard time keeping up. If the application pressure is above 30 psi or the operating temperature goes above 275°F, elastomers simply don’t perform as well as, say, PTFE. (polytetrafluoroethylene). In this article, we are going to look at 3 areas where PTFE rotary shaft seals outperform rubber shaft seals.<br />
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Need more information on PTFE Rotary Shaft Seals? Check out these additional articles from the popular Advanced EMC Technologies Blog:<br />
•Four Most Popular Rotary Shaft Seals Material Options and How They Compare<br />
•Five Ways that PTFE Rotary Seals Differ from Elastomeric Seals<br />
•Rotary Seals for Dummies: Four Questions about Shaft Surfaces for PTFE Rotary Seals<br />
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<b>Wider Temperature Range</b><br />
A major area that PTFE outpaces elastomeric seals is in its operating temperature range. As seen in the chart below, PTFE can function between -95°F to 480°F, far beyond any of its competitors in both<a href="http://ptfe-machinery.com/"> cryogenic</a> and high temperature applications.<br />
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<b>Lower Friction</b><br />
Friction generates heat, and heat buildup can be catastrophic to seals – resulting in unpleasant things like cracks or melting. PTFE has the <b>lowest</b> coefficient of friction of any solid material currently known, which is much lower than that of the elastomers typically used for seals. PTFE can also be used for <a href="http://ptfe-machinery.com/">dry running</a> (i.e., without needing a lubricant), which elastomers cannot.<br />
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<b>Better Chemical Resistance</b><br />
PTFE is known for its chemical compatibility and excellent performance even in the presence of some of the most caustic chemicals out there. Rubber, however, has some limitations.<br />
For example,<a href="http://ptfe-machinery.com/"> Viton (FKM)</a> is susceptible to ketones and acetones. EPDMdoesn’t perform well many oils and fuels, as well as hydrocarbons and concentrated acids. Nitrile (NBR) doesn’t do well in the presence of ozone, acetone, esters and ethers, or methyl ethyl ketone. Polyacrylatedoesn’t get along well with alkalines. In addition, elastomers aren’t really compatible with water, either.<br />
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<b>Higher Speed Applications</b><br />
As shown in the chart below, PTFE is the number one choice for high speed seal applications. In order or performance from low speed to high speed, we see <a href="http://ptfe-machinery.com/">Nitrile</a>, <a href="http://ptfe-machinery.com/">Polyacrylate</a>, and FKM (Viton).<br />
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Conclusion: PTFE Outforms in Four Areas</div>
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PTFE outperforms rubber seals in four distinct areas: </div>
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<b>•lower friction</b></div>
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<b>•wider temperature range</b></div>
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<b>•better chemical resistance</b></div>
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<b>•higher speed applications</b>. </div>
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The next time you need seal for an aggressive environment, don’t forget to check out <a href="http://ptfe-machinery.com/">PTFE</a> <b>(polytetrafluoroethylene) seals</b>.</div>
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Tags:PTFE,Rubber,Rubber Shaft Seals</div>
PTFE Machineryhttp://www.blogger.com/profile/11221386967155866041noreply@blogger.com1tag:blogger.com,1999:blog-8512558734070384940.post-72972331288835171012018-05-02T22:23:00.000-07:002018-05-02T22:23:17.286-07:00Electronics and medical applications help PTFE glide to global growth<div style="background: white; margin-bottom: 12.0pt; margin-left: 0cm; margin-right: 0cm; margin-top: 14.4pt;">
<span lang="EN-US" style="color: #292929; font-family: "helvetica" , "sans-serif"; font-size: 11.5pt;">Home cooks who enjoy conveniently
sliding eggs out of a pan know all about Teflon’s non-stick properties. But Teflon’s
applications go well beyond cookware, and growth in several industries is
driving global demand for the material.<o:p></o:p></span></div>
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<span lang="EN-US" style="color: #292929; font-family: "helvetica" , "sans-serif"; font-size: 11.5pt;"><a href="http://ptfe-machinery.com/">Teflon</a> is the Chemours (Wilmington, DE)
brand name for polytetrafluoroethylene (PTFE). The material offers resistance
to solvents and flames, a high melting point, strength and the non-stick
properties that home cooks know well. A 2016 Zion Research (Pune,
India) report projected that the global PTFE market, valued at $4 billion
in 2014, would grow to $6.5 billion by 2020.<o:p></o:p></span></div>
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<span lang="EN-US" style="color: #292929; font-family: "helvetica" , "sans-serif"; font-size: 11.5pt;">PTFE demand is rising as consumers buy
more electronic products that use the material, according to Zion. The
Asia-Pacific region comprised the largest market for the material in 2014,
followed by Europe. Besides electronics, PTFE is found in automotive parts,
chemical processing, textiles and medical products.<o:p></o:p></span></div>
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<span lang="EN-US" style="color: #292929; font-family: "helvetica" , "sans-serif"; font-size: 11.5pt;">Medical uses of<a href="http://ptfe-machinery.com/"> PTFE </a>are booming,
according to Bruce Nesbitt, founder and Chairman of Orion Technologies, a
Chicago-based applicator of Teflon coatings. PTFE can coat a range of
materials, a versatility that makes it useful on many medical devices. PTFE is
increasingly found on products that incorporate handles or attachments that
help clinicians manipulate the device, Nesbitt said. Devices that use PTFE
include dental drills, guidewires that steer devices through the body and
medical tubing.<o:p></o:p></span></div>
<div style="background: white; margin-bottom: 12.0pt; margin-left: 0cm; margin-right: 0cm; margin-top: 12.0pt;">
<span lang="EN-US" style="color: #292929; font-family: "helvetica" , "sans-serif"; font-size: 11.5pt;">“Any two components that slide
together, such as a metal tube and plastic housing, can benefit from the Teflon
coating on either or both sliding surfaces,” Nesbitt said. <o:p></o:p></span></div>
<div style="background: white; margin-bottom: 12.0pt; margin-left: 0cm; margin-right: 0cm; margin-top: 12.0pt;">
<span lang="EN-US" style="color: #292929; font-family: "helvetica" , "sans-serif"; font-size: 11.5pt;">The growing medical applications of
PTFE led Orion to spin off a separate company called Surface Solutions Group.
The firm can apply medical-grade coatings that further reduce friction, as well
as incorporate antimicrobials to meet the sterility requirements of medical
device makers. The more critical the end use, such as applications in aircraft
and medical devices, the more stringent the test requirements, Nesbitt said.<o:p></o:p></span></div>
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<span lang="EN-US" style="color: #292929; font-family: "helvetica" , "sans-serif"; font-size: 11.5pt;">“Medical, by far, is the tightest,” he
said. “Military and aircraft is somewhat behind that . . . automotive is
quickly bringing up the rear.”<o:p></o:p></span></div>
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