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The molecular backbone of silicone rubber is composed of silicon atoms and oxygen atoms. The rubber of this structure is particularly stable, and even after being placed outdoors for 20 years, its physical and mechanical properties will not change much. It is also particularly heat-resistant and cold resistant, with a service life of several years at high temperatures of 150 ℃. Even at 300 ℃, it can be used continuously for half a month, while cooling it to -120 ℃ can still maintain the flexibility of the rubber. Although its mechanical performance is not ideal, it can ensure stable performance over a wide temperature range. It is difficult to find a second type of this extremely valuable property in polymer materials. In addition, although the strength of silicone rubber itself is not high, adding special fillers can miraculously increase the tensile strength of the material by 40 times. Silicone rubber also has an outstanding performance, which is that its gas permeability is the best among all synthetic rubbers