... , FDA and ROHS approved.3. Various materials and hardness for your option, including Buna-N (NBR), HNBR, VITON, Silicone, FluoroSilicone, EPDM, Teflon, Natural Rubber, BUTYL ... , SBR, Neoprene, HYPALON, etc. Our Company is committed to providing customers with quality products and services ...