Patent ID: 8367776

Claim:
A fluorine-containing elastomer composition comprising a first curable perfluoropolymer comprising tetrafluoroethylene, a first perfluoroalkylvinyl ether and at least one first cure site monomer having at least one functional group selected from the group consisting of nitrile, carboxyl and alkoxycarbonyl; and a second curable perfluoropolymer comprising tetrafluoroethylene, a second perfluoroalkylvinyl ether and at least one second cure site monomer having at least one functional group selected from the group consisting of nitrile, carboxyl and alkoxycarbonyl, wherein a content of the first perfluoroalkylvinyl ether in the first curable perfluoropolymer and a content of the second perfluoroalkylvinyl ether in the second curable perfluoropolymer are different, and wherein a subtracted difference between the content of perfluoroalkylvinyl ether in the first curable perfluoropolymer and the content of the perfluoroalkylvinyl ether in the second curable perfluoropolymer is 5 to 25% by mole.