The decomposition of fluorosilicone rubber at high temperature is the same as that of silicone rubber, that is, side chain oxidation, main chain fracture, side chain thermal decomposition and various complex reactions. Because the decomposition products also cause the main chain to break, the high temperature resistance is usually worse than that of silicone rubber, which has begun to oxidize at 200℃. However, by adding a small amount of heat stabilizers such as iron, titanium and rare earth oxides, it can be significantly improved, even at 250℃, it has enough heat resistance. The effect of temperature on fluorosilicone rubber is greater than that of silicone rubber, but less than that of fluororubber.