Food Grade Silicone Rubber O Rings 1,FDA,ROHS Certificated. 2,OEM service 3,Ozone ... resistance,aging resistance,UV resistance NameFood Grade Silicone Rubber O RingMaterialNBR,NR,EPDM,SILICONE,FKM,CR,SBR,HNBR etc.CertificationISO ... Requirement2.Designs and Specification are Accepted Food Grade Silicone Rubber O Ring