Rubber O-Ring Oil Seal, Gasket, U-Ring, Quad-Ring, Glyd-Ring, Step Seal, Mechanical Seal, Extrusion Seals, Rotating Seals 1. All rubber products are made according to international standard ... (NBR), HNBR, VITON, Silicone, FluoroSilicone, EPDM, Teflon, Natural Rubber, BUTYL, SBR, Neoprene, HYPALON, etc.Our Company is committed ... British WRAS (WRC) drinking water standard certification. Rubber O-Ring