High temperature resistant silicone rubber - 70 ℃ - + 350 ℃, high and low temperature resistant. Methylphenyl vinyl silicone rubber is a product made by introducing methylphenyl silicone or diphenyl silicone into the molecular chain of methylvinyl silicone rubber. High temperature resistant silicone rubber contains certain components, which can produce good use in specific use. In specific use, it is used according to specific use standards to ensure good use performance in the power industry. The introduction of phenyl on the side group of polysiloxane will destroy the regularity of the structure of dimethylsiloxane, greatly reduce the crystallization temperature of the polymer, and expand the low-temperature application range of the polymer material.


When the content of benzene is 20-40%, it is called medium phenyl silicone rubber. It has excellent fire resistance and can extinguish itself in case of fire. It is called high phenyl silicone rubber when the content of phenyl is 40-50%. It has excellent radiation resistance, and the resistance to γ - ray is 1xi08 roentgen. Generally speaking, with the increase of phenyl content, the rigidity of silicone rubber molecular chain increases gradually, and the low temperature resistance of silicone rubber decreases gradually, but with the increase of phenyl content, the flame resistance and radiation 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 national economy. It can be used to make all kinds of molded and extruded products for cold resistant rubber in aviation industry and for sealing rings, pads, pipes and bars used in ablation, heat aging or radiation resistant parts.


Therefore, in addition to its small compression set, wide temperature range, oxidation resistance, weather resistance, shockproof, moisture-proof and good electrical insulation, methyl phenyl vinyl silicone rubber also has excellent low temperature resistance, ablation resistance and radiation resistance. These properties vary with the content of phenyl in the molecular chain. Generally speaking, benzene When the base content (ratio of phenyl to silicon atom) is 5-10%, it is called low phenyl silicone rubber. It has unique cold resistance. It can keep the elasticity of rubber at - 70 [size = 10.5pt] ~ - 100 ℃, which is the best one of all rubber at medium and low temperature. In addition, it has the advantages of methyl vinyl silicone rubber and low cost, so it has the trend of replacing methyl vinyl silicone rubber.