Is the silicone oil in cosmetics harmful to the human body?

Silicone oils generally refer to linear polysiloxane products that remain liquid at room temperature. Generally divided into two categories: methyl silicone oil and modified silicone oil. The most commonly used silicone oil—methyl silicone oil, also known as ordinary silicone oil, its organic groups are all methyl groups. Methyl silicone oil has good chemical stability, insulation, and good hydrophobicity. It is medium dimethyl dichlorosilane. Add water and hydrolyze to obtain the initial polycondensation ring body, the ring body is cracked and rectified to obtain low ring body, and then the ring body, capping agent and catalyst are put together for telomerization to obtain mixtures of various degrees of polymerization. Silicone oil can be obtained by removing low boilers by pressure distillation.

Silicone oil is generally 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 7-yl ketone, carbon tetrachloride or kerosene, slightly soluble in acetone, dioxane, ethanol and butanol . It has a small vapor pressure, high flash point and ignition point, and low freezing point. As the number of segments n is different, the molecular weight increases and the viscosity increases, so this silicone oil can have various viscosities, from 0.65 centistokes to millions of centistokes.