Properties similar to those of PTFE are displayed by the
Tetrafluoroethylene Hexafluoropropylene-copolymer FEP: [CF(CF3)-CF2(CF2-CF2)n]m
The molecular weight of this copolymer is 50,000 to 500,000 and the crystallinity is
about 50%. The maximum service temperature of 205°C is lower than PTFE.
FEP is thermoplastically moldable (injection molded at temperatures of 320°-360°C
extruded at 350°C - 410°C) is translucent, flexible, and feels heavy because of its high
density.
