Fluororubber crosslinking composition, article and sealing member

A fluoroelastomer crosslinkable composition comprising:

• a polyol-crosslinkable fluoroelastomer (a);
• and a cross-linking agent (b), wherein the cross-linking agent (b) is at least one selected from the group consisting of a compound represented by the following general formula (b1), a compound represented by the following general formula (b2), and a salt of each of the compounds with an alkali metal, an alkaline earth metal, or an onium compound:
• wherein X1 is a perfluoroalkyl group having 1 to 5 carbon atoms, a fluoroalkyl group having 1 to 5 carbon atoms, a perfluoroalkoxy group having 1 to 5 carbon atoms, a fluoroalkoxy group having 1 to 5 carbon atoms, a perfluoroacyl group having 1 to 5 carbon atoms excluding carbon in carbonyl group, a fluoroacyl group having 1 to 5 carbon atoms excluding carbon in carbonyl group, a perfluorooxycarbonyl group having 1 to 5 carbon atoms excluding carbon in carbonyl group, a fluorooxycarbonyl group having 1 to 5 carbon atoms excluding carbon in carbonyl group, or fluorine atom;
• and hydrogen atom bonded to benzene ring is optionally replaced with any substituent other than fluorine atom and chlorine atom;
• wherein X2 is a perfluoroalkyl group having 1 to 5 carbon atoms, a fluoroalkyl group having 1 to 5 carbon atoms, a perfluoroalkoxy group having 1 to 5 carbon atoms, a fluoroalkoxy group having 1 to 5 carbon atoms, a perfluoroacyl group having 1 to 5 carbon atoms excluding carbon in carbonyl group, a fluoroacyl group having 1 to 5 carbon atoms excluding carbon in carbonyl group, a perfluorooxycarbonyl group having 1 to 5 carbon atoms excluding carbon in carbonyl group, a fluorooxycarbonyl group having 1 to 5 carbon atoms excluding carbon in carbonyl group, or fluorine atom;
• and hydrogen atom bonded to benzene ring is optionally replaced with any substituent other than fluorine atom and chlorine atom.