(a) a fluoroelastomer gum comprising interpolymerized units derived from (i) a perfluorovinyl ether; (ii) a cure site monomer comprising a nitrile group; and (iii) a monomer selected from the group consisting of perfluoroolefins, olefins, vinylidene fluoride, and combinations thereof; (b) a catalyst composition comprising a divalent metal amine complex compound having the formula: wherein M is a d