When the human epidermis is stimulated by ultraviolet rays, the oxidase (tyrosinase) in the pigment cells of the basal layer of the epidermis becomes active. Tyrosine, one of the amino acids, is oxidized and polymerized to produce melanin, which is sent to the epidermis to darken the skin. Silicone sunscreens are not irritating to the skin. They are not easy to undergo chemical changes when exposed to heat and light. They are easily adsorbed on the skin. They can prevent pigmentation caused by sun exposure and prevent sunburn. Its effect is better than ordinary sunscreens. it is good. For example, sunscreens containing silicone oil will not be washed away due to sea bathing and sweating, and it can prevent the harm of ultraviolet rays. It is best to add methyl phenyl silicone oil to the sunscreen. Phenyl has a certain ability to absorb ultraviolet rays, and its sunscreen performance is better than that of methyl silicone oil. Linear alkyl silicone oil is also a valuable formulation for manufacturing sunscreens, improving its lubricity and hydrophobicity.