Physical sun protection, called physical sun protection agent, is a type of sun protection agent, which is different from chemical sun protection. Its main components are titanium dioxide and zinc oxide, which mainly block ultraviolet rays by reflection or scattering.
chemical sunscreen, also known as ultraviolet absorber, is a type of sunscreen, which is realized by absorbing harmful ultraviolet rays. Because the molecules of chemical sunscreen are absorbed by the skin, the process of absorbing ultraviolet rays occurs inside the skin and is eliminated by human metabolism.
Extended information:
The common chemical sunscreen ingredients are benzophenone, ethyl hexyl salicylate, humoliolate, sinolate, disodium phenylbenzimidazole tetraxanthate, butyl methoxydibenzoylmethane, ethyl hexyl methoxycinnamate and some patented ingredients in group laboratories such as wheat color filter.
The main components of physical sunscreen are titanium dioxide and zinc oxide. Titanium dioxide can completely block UVB, but it can only block UVA with short wavelength and cannot block long light waves. Zinc oxide is an important and widely used physical sunscreen. The principle of shielding ultraviolet rays is absorption and scattering, and it can block UVA and UVB at almost all wavelengths, and it has high safety, but the disadvantage is that it will be white and sticky when painted.
Reference: Baidu Encyclopedia-Chemical Sun Protection
Reference: Baidu Encyclopedia-Physical Sun Protection.