Silicon dioxide is widely used in various personal care products, such as skincare products, sunscreen, makeup, antiperspirants, hair care products, shower gel, facial cleansers, etc. The particle shape of ordinary silica is spherical or nearly spherical, and the particle size is usually 1-100 micrometers. It will scatter and refract light under illumination, with limited reflectivity and covering power.

Another important characteristic of silicon dioxide is its strong ability to reflect ultraviolet light, good stability, and ability to not decompose or change color after being exposed to ultraviolet radiation. It also does not react chemically with other components in the formula. Therefore, silica has played a good foundational role in the upgrading and replacement of sunscreen cosmetics.