Perfluoro rubber refers to a ternary copolymer of perfluoro(methyl vinyl) ether, tetrafluoroethylene and perfluoroolefin ether. It is also called perfluoroether rubber.

It has elasticity and the thermal and chemical stability of polytetrafluoroethylene. The long-term working temperature is -39~288 degrees Celsius, and the short-term working temperature can reach 315 degrees Celsius. It still has a certain plasticity below the brittle temperature, is hard but not brittle, and can be bent. In addition to swelling in fluorinated solvents, it is stable to all chemicals.

It is obtained by emulsion polymerization of perfluoro(methyl vinyl) ether, tetrafluoroethylene and a small amount of perfluoroene ether with peroctanoic acid saddle as dispersant and ferric persulfate-sodium sulfite as initiator at a pressure of 1.4~4.2MPa and a temperature of 40~100 degrees Celsius. It is vulcanized by diamine or 2,2'-bis(4-phenylhydroxypropane) and fluorine on the perfluorobenzene ring to undergo double nucleophilic substitution.

The processing performance is poor. It is used in places where fluororubber is not competent and the conditions are harsh. It is used to make seals resistant to various media, such as rocket fuel, umbilical cord, oxidizer, nitrogen tetroxide, fuming nitric acid, etc., and is used in aerospace, aviation, chemical, petroleum, nuclear energy and other industrial sectors.

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