| abstract |
A seal (10) is made of a rubber composition containing a hydrogenated nitrile-butadiene rubber as a main part of a rubber component. The rubber component contains: a first hydrogenated nitrile-butadiene rubber, an acrylonitrile content of which is 48.0% by mass or more and 52.0% by mass or less; and a second hydrogenated nitrile-butadiene rubber, an acrylonitrile content of which is lower than the acrylonitrile content of the first hydrogenated nitrile-butadiene rubber. |