OEM rubber o ring 1. NR, CR, NBR, SBR, VITON, EPDM, HNBR, SILICONE, BUNA, ... , etc. 2. ISO9001 3. Prompt delivery: 1 week OEM rubber o ring MaterialNR,CR,NBR,SBR, SILICONE,VITON,EPDM, HNBR, BUNA, etc ... be designed by the customerRubber CompoundCan be UL, FDA, ROSH or REACH approved, and free test slabs and hardness testers can ...