The high temperature resistance of silicone comes from its unique molecular structure of polydimethylsiloxane. The Si-O-Si bond energy of the main chain is much higher than that of the C-C bond of ordinary rubber, and its thermal stability is extremely strong. Secondly, the molecular chain has flexibility and forms a protective effect by connecting with organic side groups, making it difficult to decompose and deform in high temperature environments, and able to maintain good elasticity for a long time.
From the perspective of temperature resistance, silicone can be divided into multiple grades. Conventional silicone can be used for a long time at temperatures ranging from -60 ℃ to 200 ℃, and can withstand high temperatures of up to 250 ℃ in the short term. Modified high-temperature silicone can meet the needs of general scenarios such as daily kitchen utensils and ordinary seals. Its long-term temperature resistance can be increased to 200 ℃ to 250 ℃, and it can reach 300 ℃ in the short term. It is suitable for industrial scenarios such as automotive engines and high-temperature steam equipment. Special high-temperature silicone can be modified with benzene, fluorosilicone, or filled with ceramics. Its long-term temperature resistance can reach 250 ℃ to 300 ℃, and its short-term peak can even exceed 350 ℃. It can cope with extreme high-temperature conditions such as aerospace and firefighting equipment. In addition, the actual temperature resistance of silicone is also affected by the purity of raw materials, production process, and usage environment. It is worth mentioning that high-quality silicone can be further improved in temperature stability through secondary vulcanization process, reducing deformation and odor problems at high temperatures.
Overall, the temperature resistance of silicone materials is not limited to a single temperature range, but can cover various scenarios from daily to extreme.
