Silicone is a valuable gasket material because it displays strong resistance to extreme temperatures. Silicone-based gaskets can have operating temperatures that range between roughly -40 degrees to 350 degrees Fahrenheit. In addition, their resistance to ultraviolet light makes them useful in outdoor settings, while their flame tolerance within a certain thickness range has applications in electronics and transit industries. Silicone gaskets come in foam and sponge varieties, and can be reinforced with other materials to improve tensile strength or adjust thermal and electrical conductivity.