Fluorine

Plastics

Fluorinated Ethylene Propylene (FEP) is a copolymer of Hexafluoropropylene and tetrafluoroethylene that shares PTFE’s chemical resistance and useful low friction properties, but is more easily formable.

The name Teflon® is often mistaken to only refer to PTFE, but FEP and PFA also come under this title. FEP is softer, slightly more flexible, but does not withstand repetitive folding as well as PTFE. It also possesses an inferior coefficient of dynamic friction and slightly lower tensile strength. Fluorinated Ethylene.