O-ring material used as a nitrile rubber, carboxylic acid nitrile, fluorine rubber, ethylene propylene rubber, hydrogenated nitrile rubber, silicone rubber, neoprene, fluorosilicone rubber, polyurethane, epichlorohydrin rubber, styrene butadiene rubber, small base rubber, natural rubber, ethylene / B acid rubber, polyacrylate rubber, fluorine rubber and so on the whole. The same kind of rubber as different formulations, performance indicators have a greater change. So simply fill in the column material nitrile rubber or nitrile 40 is not accurate. For the O-ring material with a special Ministry of Chemical Industry standards such as: HG / T 2579-1994, HG / T 2021-1991, HG / T 2333-1992, HG / T 3089-2001, HB 5290-1991 and so on. HG / T 2579-1994 specifically to remove the material specific categories, only gives the material some performance indicators.