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The high temperature resistance of silicone rubber is the same as that of ordinary rubber, which is the best among the current elastomers. 26-41 silicone can be used for a long time at 250℃ and for a short time at 300℃; 246 silicone has better heat resistance than 26-41. The physical properties of 26-41 after air heat aging at 300℃×100 hours are equivalent to those of 246 after hot air aging at 300℃×100 hours, with a hardness of 90~95 degrees. 246 maintains good elasticity after 16 hours of hot air aging at 350℃, and maintains good elasticity after 110 minutes of hot air aging at 400℃. After 110 minutes of hot air aging at 400℃, the elongation of the rubber containing spray carbon black, thermal cracking carbon black or carbon fiber increases by about 1/2~1/3, and the strength decreases by about 1/2, but still maintains good elasticity. 23-11 silicone can be used for a long time at 200℃ and for a short time at 250℃.

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