| 摘要 |
[Object] To provide a fluororubber-based sealing material which is excellent in sealing properties under high/low temperature load and is capable of sealing at a temperature of not higher than −40° C. even when gas oil (diesel fuel) is used. [Means for Solving] A fluororubber-based sealing material obtained by crosslinking a composition for a fluororubber-based sealing material, said composition comprising 100 parts by weight of a fluorine-containing copolymer which contains 64 to 69% by weight of fluorine, has a crosslinking site derived from a bromine-containing compound and/or an iodine-containing compound and is capable of being crosslinked by a peroxide, 0.5 to 6 parts by weight of an organic peroxide and 1 to 10 parts by weight of a polyfunctional monomer, wherein the fluorine-containing copolymer in the composition for a fluororubber-based sealing material is a fluororubber polymer obtained by copolymerizing (a) VDF, (b) TFE, (c) FMVE, (d) FMMVE and (e) brominated/iodinated unsaturated fluorohydrocarbon.
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