... , pneumatic and automobiles.Hardness: Shore 50-75Color: black,white,red,green,yellow,blue or follow the color codeAdvantageGood Ozone ... TS16949, NSF, WRAS, UL, TZW, W270, ACS, FDAMaterial100% pure silicone o-ringMaterial usage is based on the final product ... 7) High and low temperature resistance, oil resistance, anti-ozone and aging, wearing Various sizes & colors as following: high quality automotive ...