Sunday, March 5, 2017

Properties of PTFE and Some Other Materials Difference

PTFE (Polytetrafluoroethylene) Teflon ® The combination of chemical and physical properties of PTFE is a consequence of its true fluorocarbon structure. This unusual structure leads to a material which has an almost universal chemical inertness; complete insolubility in all known solvents below 300°C; excellent thermal stability; and unsurpassed electrical properties, including low dielectric loss, low dielectric constant and high dielectric strength. Furthermore, PTFE does not embrittle at very high or at very low temperatures.
Properties of PTFE

Corona Resistant PTFE is a corona resistant form of PTFE. It is a homogeneous insulation having essentially all of the properties of pure PTFE, but having approximately a thousand-fold longer high-voltage life. Corona Resistant PTFE is unique among high voltage insulations in its excellent resistance to electro-mechanical and chemical-mechanical stress cracking.

FEP (Fluorinated Ethylene Propylene) Teflon ®, life PTFE, has a fully fluorinated structure which leads to excellent chemical, thermal, and electrical properties. However, the high temperature limit for FEP is lower than PTFE, approximately 200°C instead of 260°C. FEP has good melt-flow characteristics which permit melt bonding to itself, to Kapton film, and to PTFE.

Polyurethane Extraordinary toughness and abrasion resistance are characteristics of polyurethane. As a result, cable jackets can be made considerably thinner than if more conventional jacketing materials were used. In addition, polyurethane has good low temperature performance, good weathering characteristics, and is resistant to oil, gasoline, and non-polar solvents.

PVC (Poly Vinyl Chloride) A good balance of properties: electrical, mechanical and thermal make PVC the choice material for cable jacketing applications where size and weight are not critical.


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