Silicone Silicone (SI) rubber is a semi-organic elastomer made from silicone, oxygen, hydrogen and carbon. It has outstanding resistance to temperature extremes. Under normal operating conditions, temperatures as high as 260ƒ C (500ƒ F) and as low as -75ƒ C (-103ƒ F) have little effect on the physical and electrical properties. At temperatures between -85ƒ C (-121ƒ F) and +260ƒ C (+500ƒ F), it is superior in its resistance to compression set, compared with all other available elastomers. At moderate temperatures, it has poor tensile strength, tear resistance and abrasion resistance. However, at extreme temperatures, where other materials have failed, the physical properties of silicone remain unchanged. Silicone has outstanding resistance to sunlight, ozone, oxygen, gases and moisture. It has a temperature range of -100ƒ to +315ƒ C (-148ƒ to +599ƒ F).