... & low temperature resistance, 3.Design service 4.ROHS,UL,FDA,ISO9001:2008; 5,OEM Service Transparent Food Grade Silicone O Ring1, Material:NBR,CR ... ,SBR,EPDM,IIR,NR,HNBR,ACM,EP,Silicone,Viton etc.2, Hardness ... drawings or samples.8, OEM or ODM is welcomed. Transparent Food Grade Silicone O Ring