Perfluoroelastomers (FFKM) are the elastomeric form of poly (Tetrafluoro ethylene) or PTFE. These elastomers have a fully fluorinated backbone. They are copolymers of tetrafluoroethylene and a perfluorinated ether such as Perfluoromethylvinylether (PMVE). Thus, the backbone includes oxygen atoms that are part of the ether groups which provide elasticity. Depending on the type of the ether (marked by the length of the side chain), the fluorine content varies. To vulcanize FFKM, small amounts of a cross-linkable monomer (CSM) are introduced. These are typically Cyano-functional vinyl ethers. ...
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