... ,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:Between 30~90 shore A3, Property ... samples.8, OEM or ODM is welcomed. Transparent Food Grade Silicone O Ring