Fluoroelastomer curable composition

A composition (C) comprising:

• at least one fluroelastomer (A), wherein fluoroelastomer (A) is a (per)fluoroelastomer comprising iodine cure sites in an amount such that iodine content is in a range from 0.04 to 10.0% wt, with respect to the total weight of fluoroelastomer (A);
• at least one initiator (P), wherein initiator (P) is a photoinitiator of formula:
• wherein:
• each of R1′H, equal to or different from each other, is a C1-C12 hydrocarbon group, optionally containing one or more than one heteroatom, selected from the group consisting of oxygen, nitrogen, and sulfur;
• j′ is zero;
• R2′H is a phenyl, a methyl group or an ethyl group;
• R3′H is selected from a methyl group and an ethyl group;
• said initiator (P) being present in an amount of 4.0 to 15.0 phr, based on fluoroelastomer (A);
• and
• at least one compound (U), wherein compound (U) is a polyunsaturated compound selected from:
• (U-1) tri-substituted isocyanurate compounds of general formula:
• wherein each of Risocy, equal to or different from each other and at each occurrence, is independently selected from H or a group —Rrisocy or —ORrisocy, with Rrisocy being C1-C5 alkyl, optionally comprising halogen(s), and each of Jisocy, equal to or different from each other and at each occurrence, is independently selected from a bond or a divalent hydrocarbon group, optionally comprising heteroatoms, and
• (U-2) tri-substituted cyanurate compounds of general formula:
• wherein each of Rcy, equal to or different from each other and at each occurrence, is independently selected from H or a group —Rrcy or —ORrcy, with Rrcy being C1-C5 alkyl, optionally comprising halogen(s), and each of Jcy, equal to or different from each other and at each occurrence, is independently selected from a bond or a divalent hydrocarbon group, optionally comprising heteroatoms;
• said compound (U) being present in an amount of 2.5 to 15.0 phr, based on fluoroelastomer (A).