Patent ID: 6927259

Claim:
A specialty fluoroelastomer comprising copolymerized units of 45 to 80 weight percent tetrafluoroethylene; 10 to 40 weight percent propylene; and 0.1 to 15 weight percent of a cure site monomer having the formula R f —(CF 2 ) n —CH═CH 2 wherein R f is a perfluorinated alkyl group or perfluorinated alkoxy group containing between 1 and 7 carbon atoms, n is an integer between 1 and 6 and wherein the total number of carbon atoms in the cure site monomer is less than 10, said fluoroelastomer being free from copolymerized units of vinylidene fluoride and with the proviso that the cure site monomer may not be 4-bromo 3,3,4,4-tetrafluorobutene1.