PTFE O-Ring

Polytetrafluoroethylene (PTFE) is a high molecular weight polymer, one of the most versatile plastic materials known and useful for a large range of
products for applications excluded to other materials.

Polytetrafluoroethylene (PTFE for short) is a low friction synthetic rubber that has long been used for sealant applications for a variety of substances including gasses, fluids, and chemicals.

PTFE O-Ring Temperature Range

Although PTFE has lower mechanical properties compared to other plastics, the material’s chemical resistance in tandem with its ability to withstand a wide temperature range (-100oF to +400oF) allow PTFE o-rings to provide effective resistance to weathering as well as electrical and thermal insulation.

Because PTFE is such a dense material, it cannot be “melt processed” – it must be compressed and sintered to form useful shapes (like o-rings).

Top Applications

outdoors
lubricants
hydrocarbons
acids
alkalis
detergents
alcohol
ketones
steam
refrigerants

Mechanical Weaknesses

high vacuum seals
low compression vacuum sealing flanges
super-heated steam

Increase Mechanical Properties with Filled Grades
As shown in the table above, PTFE o-rings have some mechanical vulnerabilities compared to other plastics. If needed, these properties can be enhanced by adding fillers, such as:

Glass Fibers
Carbon
Graphite
Molybdenum disulphide
Bronze

Source:https://www.sukoptfe.com/PTFE-O-Ring