1. Structural properties of silicone
The reason why silicone has developed rapidly in the cosmetics industry is mainly due to its unique molecular structure. Organosilicon is a semi-inorganic and semi-organic polymer compound, which presents a helical structure in space. This determines that it has many excellent properties: lubricity, hydrophobicity, physiological inertia, anti-ultraviolet radiation and compatibility, etc., to improve cosmetic performance. Silicone materials have entered the field of cosmetics and have undergone rigorous toxicological research. It has been confirmed that this kind of material has no toxicity in oral test, no allergy in skin irritation test, no damage in eye irritation test, no abnormality in inhalation toxicity test, no poisoning phenomenon in gastric absorption and metabolic function, no adverse effects in genetic test, and no environmental impact test. The phenomenon of bioaccumulation.

2 Silicones commonly used in cosmetics
Silicone products used in cosmetics today mainly include: dimethylpolysiloxane, methylphenylpolysiloxane, hydrogen-containing silicone oil, cyclic polysiloxane, methyl polysiloxane emulsion, polyether Modified silicone oil, alkyl modified silicone oil, amino modified silicone oil, silicone wax, silicone resin, silicone elastomer and silicone treated powder series.

3 Application of common silicone oil in cosmetics
Silicone oil is a colorless, odorless, transparent liquid. It is one of the least toxic products in cosmetics. It is non-irritating, non-allergic, and non-stinging. It has a neutral reaction to human skin and is an excellent material for modern cosmetics. There is a large distance between silicone oil molecules, the molecular force is much weaker than that of hydrocarbons, the surface tension is low, and it has high surface activity. Therefore, silicone oil has excellent defoaming and anti-foaming properties and good film-forming properties. It is easy to form a very thin film. It is used in cosmetics and applied to the human body, just like a thin gauze mask, and achieves protection. Skin action. Silicone oil is hydrophobic and insoluble in water. Silicone oil has excellent isolation and lubricity with other substances, and has the property of blocking moisture without affecting the breathability. Has a high degree of gloss, making the skin brighter.

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