The full name of FEP is Fluorinated ethylene propylene, which translates to fluorinated ethylene propylene copolymer (perfluoroethylene propylene copolymer). English trade name: Teflon* FEP, is a class of chemical substances.

FEP is a copolymer of  tetrafluoroethylene and  hexafluoropropylene.

FEP crystal melting point is 304℃, density is 2.15g/CC (grams/cubic centimeter).

FEP  can be applied to soft plastics, and its tensile strength, abrasion resistance, and creep resistance are lower than many engineering plastics.

It is chemically inert and has a low dielectric constant over a wide range of temperature and frequency (2.1)