... in bathroom product, valve, faucet, machine, hydraumatic, pneumatic and automobiles.Hardness: Shore A40,50,60,70,80,90Color: black,white,red ... the color code4.Advantage:Good Ozone resistance, aging resistance, high/low temperature resistance, acid/alkali resistance, weather resistance, abrasion resistance, voltage ... time.8.Delivery by sea or air on time. FDA silicone rubber o ring