These materials used meet the FDA standards for non toxicity, and range from Neoprene, Nitrile, Silicone, EPDM, VITON,HYPALON etc, to teflon. We also offer rubber gaskets for Triclover clamps, Sponge Gasket,DIN gaskets, SMS gaskets, BUTTERFLY VALVE gaskets , sucker bellows, shlfter gaskets etc.