Perfluoroelastomers (FFKM) maxime synthesis e tetrafluoroethylene, perfluoromethyl vinyl eter et vulcanizationis puncto monomerorum constant, et repugnantiam chemicae, caloris, extrusionis et deformationis altae temperaturae compressionis habent.Exceptis quibusdam solventibus fluorocarbon altum, nullis mediis incluso aethere, ketonibus, esters, amids, nitrilibus, agentibus oxidentibus validis, fuels, acida, alkalis, etc. Permeabilitatem habet in chemicis et gasis, et bonis electricis. possessiones.