Silicone oil usually refers to linear polysiloxane products that maintain liquid state at room temperature. It is generally colorless (or light yellow), odorless, non-toxic and non-volatile liquid. Their molecular weight is not high, and they are in flowing state at normal temperature, so they are usually called silicone oil. Generally, it is not only used, but made by special formula, often used as an auxiliary material to produce a certain effect. Generally speaking, there are three basic forms of silicone oil in the market: pure silicone oil, solution and lotion.

First, pure silicone oil has very strong stability, heat resistance, frost resistance, good storage, high flash point and high ignition point, and few storage and transportation problems;

Second, in fact, it is often necessary to dilute the silicone oil solution. Sometimes it is desirable to add active auxiliary agents (catalysts, cross-linking agents, etc.) to the solution for storage and use. Aliphatic, aromatic or chlorinated hydrocarbons can be used as the solvent as required. Other kinds of solvents can be used in special cases. Generally, the concentration of polymer polysiloxane solution can only reach 35%, otherwise the viscosity is too high;

Third, a large part of silicone oil or silicone oil containing products are made into lotion. Compared with solvent silicone oil, it has the advantages of low price, non combustible, harmless to health, etc. Different from solvent type, all organosilicon lotion are heterogeneous systems of "oil in water" type. Its external closed phase is the water phase. Silicon oil is dispersed in the water phase as tiny drops, which is easy to dilute with water to the required concentration for application. The stability of this lotion can be achieved by minimizing the droplets and stabilizing the emulsifier effect.
Silicone oil can be divided into primary products and secondary products according to its processing status.

The former refers to the silicone oil products before processing, including four categories: hydroxy silicone oil, silicon functional silicone oil, carbon functional silicone oil and inactive modified silicone oil. Among these four categories, the first two are traditionally called linear silicone oil, and the latter two are called modified silicone oil.

Secondary silicone oil products refer to the products such as creams, lotion and solutions, such as silicone grease, silicone paste, defoamer, mold release agent and isolating agent, which are made from silicone oil with thickeners, surfactants, solvents and additives and processed by specific processes.

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