... 2,Material:Silicone,EPDM,NR,SBR 3,Process:Molding Compression,Injection,rubber metal bonded. 1,Rubber Retainer2,Material:Silicone,EPDM,NR,SBR3 ... ,Process:Molding Compression,Injection,rubber metal bonded.4,Material Standars:Roths,Pahs,FDA5,Performance: Hardness ...