... ,14001 4.Type:X ring,U ring,V ring,O ring,etc CR Rubber o ring 1. Main materialNeoprene(CR),also can use ... Natural rubber, SBR, NBR, IIR, PU, EPDM, Silicone, FKM, FVMQ, HNBR ... and so on.7. Main performanceCR has good mechanical strength,high ozone and weather resistance,low flammability,good resistance toward chemicals ...