Fluoroelastomer crosslinkable composition and article

A fluoroelastomer crosslinkable composition comprising a fluoroelastomer (a) and a cross-linking agent (b),

• wherein the fluoroelastomer (a) contains vinylidene fluoride unit, and
• the cross-linking agent (b) is at least one selected from the group consisting of:
• a compound (b1) having a monocyclic aromatic ring (Ar-1), 2 or more hydroxy groups directly bonded to carbon atoms constituting the aromatic ring (Ar-1), and a substituent (β) directly bonded to a carbon atom constituting the aromatic ring (Ar-1) for which at least one of Hammett's substituent constants, σm and σp, is a value of 0.03 or more (excluding a halogen atom, an amino group, a sulfanyl group, an acid group, hydroxy group, and a group containing these groups, and an aromatic ring-containing group in which a group for which at least one of Hammett's substituent constants, σm and σp, is a value of 0.03 or more is directly bonded to a carbon atom constituting the aromatic ring);
• and
• a salt of the compound (b1) with an onium compound,
• the compound (b1) is a compound represented by the following general formula (b1):
• wherein m is 1 or 2;
• X is the substituent (β);
• and n is an integer of 1 to 3,
• the substituent (β) is at least one selected from the group consisting of a methoxy group, an acetyl group, and a methoxycarbonyl group.