Material for gasket

A material for a gasket, wherein a chromate or non-chromate film, a phenol resin primer layer and a polyol-crosslinked fluororubber layer are formed on one or both surfaces of a steel plate in this sequence from the side of the steel plate;

• the polyol-crosslinked fluororubber layer is a rubber layer obtained by applying a fluororubber composition that comprises fluororubber, a polyol-based cross-linking agent, an amine-based cross-linking accelerator and silica to the phenol resin primer layer, followed by heating;
• the polyol-based cross-linking agent is selected from the group consisting of polyhydroxy aromatic compounds selected from 2,2-bis(4-hydroxyphenyl)propane, 2,2-bis(4-hydroxyphenyl)perfluoropropane, 1,3-dihydroxybenzene, 4,4′-dihydroxydiphenyl, 4,4′-dihydroxydiphenylmethane, and 2,2-bis(4-hydroxyphenyl)butane;
• and alkali metal salts and alkaline earth metal salts thereof;
• the amine-based cross-linking accelerator is a tertiary amine or a salt of a tertiary amine having an acid dissociation constant (pKa) of 8.5 to 14, obtained by a reaction between a tertiary amine and an acid;
• the fluororubber is at least one selected from the group consisting of a vinylidene fluoride/hexafluoropropylene-based copolymer, a vinylidene fluoride/hexafluoropropylene/tetrafluoroethylene-base copolymer, and a tetrafluoroethylene/propylene/vinylidene fluoride-based copolymer;
• a content of the silica in the polyol-crosslinked fluororubber layer is 10 to 40 parts by mass per 100 parts by mass of the fluororubber.