... manufacturing rubber products for more than 20 years. We can design and produce according to your requirements, or drawings & samples.O rings are ... .Our common materials include NBR, silicon, Viton, EPDM, NR, PU, and such as neoprene, HNBR, SBR, BR, butyl etc also can ... complete range of specifications of o rings, and we also can supply mini o rings and big o rings, our o rings ...