Poly methyl phenyl siloxane (PMPS), as a modified organic silicon polymer, exhibits superior comprehensive properties compared to traditional dimethyl silicone oil due to the introduction of phenyl structures in its molecular chain. Its appearance is a colorless to pale yellow transparent liquid, with unique amorphous nature. It does not undergo strain-induced crystallization when heated and maintains stable performance within a wide temperature range of -70°C to 300°C. It has a small viscosity-temperature coefficient, low volatility, and a 2-hour evaporation rate of less than 2% at 250°C. Additionally, the phenyl groups give it excellent antioxidant, radiation resistance, and electrical insulation properties. It has excellent dielectric strength and is compatible with high compression ratio and surface tension, making it suitable for extreme working conditions. 
In the industrial field, PMPS is the core raw material of high-temperature resistant coatings, capable of withstanding temperatures ranging from 500°C to 650°C. It is used as a protective coating for components such as automotive exhaust pipes, industrial boilers, and heat exchangers, and possesses waterproof, rust-proof, and corrosion-resistant properties. As a heat transfer medium, it can be used in special metal heat treatment bath solutions and instrument calibration bath solutions, with a higher thermal conductivity efficiency than ordinary silicone oil. Additionally, it has good compatibility with organic resins and can be used as a base oil for high-temperature lubricating grease and high-pressure insulating oil. It is widely applied in the insulation and lubrication of mechanical transmissions and electronic electrical equipment, and also plays an important role in extreme environment components of aerospace equipment.