Fluororubber composition

A fluororubber composition comprising:

• a fluororubber (A);
• and
• a carbon black (B),
• the fluororubber (A) being a vinylidene fluoride-based fluororubber comprising a structural unit derived from vinylidene fluoride (VdF unit) and a structural unit derived from at least one monomer selected from the group consisting of hexafluoropropylene (HFP), 2,3,3,3-tetrafluoro propylene, and perfluoro(alkyl vinyl ether) (PAVE),
• the molar ratio of the VdF unit to the structural unit derived from at least one monomer selected from the group consisting of HFP, 2,3,3,3-tetrafluoro propylene, and PAVE being 50/50 to 78/22,
• wherein the fluororubber composition has a difference δG′ (G′ (1%)-G′(100%)) of not lower than 120 kPa and not higher than 3,000 kPa, where G′(1%) denotes a modulus of shearing elasticity at a dynamic strain of 1%, G′(100%) denotes a modulus of shearing elasticity at a dynamic strain of 100%, and G′(1%) and G′(100%) are determined by a dynamic viscoelasticity test carried out on an unvulcanised rubber with a rubber process analyzer (RPA) in a condition that the measurement frequency is 1 Hz and the measurement temperature is 100° C.