1. ROHS,ISO 2. NBR,EPDM,SR,CR,SBR,FPM etc. 3. UV,FR,oil/ ... packing: follow customers' requirement Rubber O Ring Gasket1) Available material : NBR,SILICONE,VITON(FKM),Neoprene,HNBR,Natural rubber,EPDM.2) All ... low temperature resistance, oil resistance, anti-ozone and aging, wearing NBR flat rubber gaskets