| abstract |
(57) Abstract: [PROBLEMS] To provide a rubber composition for a sealing material, which is excellent in chlorine water resistance and compression set and can be stably used for a long period of time. SOLUTION: Ethylene-propylene rubber 20 to 80% by weight, hydrogenated acrylonitrile-butadiene rubber 80 An organic peroxide is added to a rubber mixture consisting of .about.20% by weight, and peroxide crosslinking is carried out by this organic peroxide. |