The temperature range of high temperature resistant silicone rubber is - 70 ℃ - + 350 ℃. The commonly used one is methyl phenyl vinyl silicone rubber, which is a product obtained by introducing methyl phenyl siloxane link or diphenyl siloxane link into the molecular chain of methyl vinyl silicone rubber. The introduction of phenyl into the side group of polysiloxane destroys the regularity of dimethylsiloxane structure, greatly reduces the crystallization temperature of the polymer and expands the low-temperature application range of the polymer material.

When the phenyl content is 20 ~ 40%, it is called medium phenyl silicone rubber. It has excellent flame resistance and can extinguish itself once it catches fire.

When the phenyl content is 40 ~ 50%, it is called high phenyl silicone rubber. It has excellent radiation resistance and high heat resistance γ- The ray is 1xi08 roentgen. Generally speaking, with the increase of phenyl content, the rigidity of silicone rubber molecular chain gradually increases, and the low temperature resistance of silicone rubber gradually decreases. However, with the increase of phenyl content, the flame resistance and irradiation resistance of vulcanizate are improved.

Methyl phenyl vinyl silicone rubber is one of the important materials in aerospace industry, cutting-edge technology and other sectors of the national economy. It can be used to make all kinds of molded and extruded products. It can be used as cold resistant rubber in aviation industry and sealing rings, gaskets, pipes and bars in parts resistant to ablation, heat aging or radiation.

Therefore, in addition to the small compression set, wide temperature range, oxidation resistance, weather resistance, shock resistance, moisture resistance and good electrical insulation properties of methyl phenyl vinyl silicone rubber, methyl phenyl vinyl silicone rubber also has excellent low temperature resistance, ablation resistance and irradiation resistance These properties vary with the phenyl content in the molecular chain. Generally speaking, low phenyl silicone rubber is called when the phenyl content (the ratio of phenyl to silicon atoms) is 5 ~ 10%. It has unique cold resistance and can still maintain the elasticity of the rubber at - 70 [size = 10.5pt] ~ - 100 ℃, which is the best kind of rubber at medium and low temperature, In addition, it has the advantages of methyl vinyl silicone rubber and low cost, so it has a great trend to replace methyl vinyl silicone rubber.

The special components contained in high temperature resistant silicone rubber can promote its good performance in the power industry, and can play an important value and trend.