Patent ID: 8742006

Claim:
A cross-linkable nitrile rubber composition comprising a nitrile rubber (A1), including 10 to 60 wt % of acrylonitrile unit, 20 to 89.5 wt % of 1,3-butadiene unit and 0.5 to 20 wt % of α,β-ethylenically unsaturated dicarboxylic acid monoester monomer unit and having iodine value of 120 or less, a silica (B1) having CaO value determined by X-ray fluorescence composition analysis of 1 to 30 wt %, and a polyamine-based crosslinking agent (C1), wherein a content of said silica (B1) is more than 20 and 300 or less parts by weight per 100 parts by weight of said nitrile rubber (A1).