Methyl silicone oil and phenyl silicone oil: performance game under high temperature environment
Core difference: Methyl silicone oil (polydimethylsiloxane) is known for its wide temperature range applicability from -50 ° C to 200 ° C, while phenyl silicone oil (polydimethylphenylsiloxane) increases its temperature resistance limit to over 250 ° C and significantly enhances its radiation resistance and refractive index by introducing a phenyl structure.
Comparison of application scenarios:


Methyl silicone oil: occupying 60% of the mold release agent market, used for plastic and rubber processing; As a defoamer widely used in the food and pharmaceutical industries, its electrical insulation properties make it the preferred impregnating agent for transformers and capacitors.
Phenyl silicone oil: accounting for 75% in the field of LED packaging, its high refractive index (1.425-1.533) can improve light efficiency; In the aerospace field, as a high-temperature heat transfer oil, it is used in satellite thermal control systems. The gel time in 250 ℃ hot air is up to 1750 hours.
Technological breakthrough: Phenyl silicone oil achieves performance customization by adjusting the phenyl content (low phenyl 5% -10%, medium phenyl 25%, high phenyl 45%). For example, the high phenyl type can withstand a gamma radiation dose of up to 10 ⁶ Gy in nuclear reactor protective coatings.