Silicone oil is a polyorganosiloxane with chain structure of different degrees of polymerization. It is obtained by hydrolyzing dimethyl dichlorosilane with water to obtain the initial polycondensation ring body, the ring body is cracked and rectified to obtain the lower ring body, and then the ring body, head agent and catalyst are put together to telomerize to obtain each Silicone oil can be obtained by removing low boilers from a mixture of different polymerization degrees by vacuum distillation.
The most commonly used silicone oil, organic groups are all methyl, called methyl silicone oil. The organic group can also use other organic groups to replace part of the methyl group, so as to improve certain properties of silicone oil and apply to various purposes. Common other groups include hydrogen, ethyl, phenyl, chlorophenyl, trifluoropropyl, and the like. In recent years, organo-modified silicone oils have developed rapidly, and many organo-modified silicone oils with special properties have emerged.
Silicone oil is generally a colorless (or light yellow), odorless, non-toxic, non-volatile liquid. Silicone oil is insoluble in water, methanol, glycol and -ethoxyethanol, miscible with benzene, dimethyl ether, methyl ethyl ketone, carbon tetrachloride or kerosene, slightly soluble in acetone, dioxane, ethanol and alcohol . It has a small vapor pressure, high flash point and ignition point, and low freezing point. With the different number of segments n, the molecular weight increases and the viscosity also increases. Therefore, the silicone oil can have various viscosities, from 0.65 centistokes to millions of centistokes. If low-viscosity silicone oil is to be obtained, acidic clay can be used as a catalyst, and telomerization can be carried out at a temperature of 180°C, or sulfuric acid can be used as a catalyst, and telomerization can be carried out at a low temperature to produce high-viscosity silicone oil or viscous material, which can be alkaline catalyst.
According to the chemical structure, silicone oil can be divided into methyl silicone oil, ethyl silicone oil, phenyl silicone oil, methyl hydrogen-containing silicone oil, methyl phenyl silicone oil, methyl chlorophenyl silicone oil, methyl ethoxy silicone oil, methyl trifluoropropane Base silicone oil, methyl vinyl silicone oil, methyl hydroxy silicone oil, ethyl hydrogen silicone oil, hydroxyl hydrogen silicone oil, cyanide silicone oil, etc.; in terms of application, there are damping silicone oil, diffusion pump silicone oil, hydraulic oil, insulating oil, Heat transfer oil, brake fluid, etc.
Silicone oil has excellent heat resistance, electrical insulation, weather resistance, hydrophobicity, physiological inertness and small surface tension, in addition to low viscosity-temperature coefficient, high compression resistance) some varieties also have radiation resistance performance.


About silicone oil, please check the details:
https://www.siliconefoam.net/product-hydroxyl-silicone-oil-for-fumed-silica-iota-1203d-.html