PTFE is a popular O-Ring which is white in color. The PTFE O-Rings are popular for use in applications which require a chemically resistant and non-compressible material. PTFE is a plastic that offers high chemical resistance, low and high temperature capability, resistance to weathering, low friction, electrical and thermal insulation, and "slipperiness".
General Properties of the PTFE O-rings
PTFE's mechanical properties are low compared to other plastics, but its properties remain at a useful level over a wide temperature range of -73°C to 204°C. The PTFE O-rings have excellent thermal and electrical insulation properties and a low coefficient of friction. PTFE O-rings are very dense and cannot be melt processed - the raw material must be compressed and sintered to form useful shapes.
Mechanical properties of the PTFE O-rings are often enhanced by adding fillers such as glass fibers, carbon, graphite, molybdenum disulphide, and bronze. Generally, the normal grade of non-filled PTFЕ O-rings maintains excellent chemical and high temperature characteristics, while fillers improve mechanical strength, stability, and wear resistance.