Silicone oil usually refers to linear polysiloxane products that remain liquid at room temperature. They are generally colorless (or light yellow), tasteless, non-toxic and non-volatile liquids. Their molecular weight is not high, at room temperature for the flow state, so it is usually called silicone oil. It is not used purely, but is made with a special formula, often as an auxiliary material to perform a certain function.

Generally speaking, there are three basic forms of silicone oil on the market: pure silicone oil, solution and emulsion.

1. Pure silicon oil has very strong stability. Heat resistance, frost resistance, good storage, with high flash point and high ignition point, few storage and transportation problems.
2. It is often necessary to dilute the silicone oil solution. Sometimes hope to add active auxiliary agent in the solution (catalyst, crosslinking agent, etc.) in order to facilitate storage and use, according to the need to use aliphatic, aromatic or chlorinated hydrocarbons as solvents, special circumstances to use other kinds of solvents, general polymer polysiloxane solution, concentration can only reach 35%, otherwise the viscosity is too large.
3. A large part of silicone oil or silicone oil containing products are made into emulsion form. Compared with the solvent silicone oil, it has the advantages of low price, not easy to burn and harmless to health. Different from solvent, all silicone emulsions are "oil in water" type heterogeneous system, its external closed phase is water phase, silicone oil dispersed in the water phase in very small droplets, easy to dilute with water to the desired concentration for application, the stability of this emulsion can be achieved by making the droplets as small as possible and the stabilizing effect of emulsifier.