Titanium Dioxide tiO2 Nanoparticles Used as a UV Filter in Sunscreen
Spec: 30-50nm, anatase or rutile,99.5%
Titanium dioxide, in the form of nanoparticles used to render creams and lotions transparent, is currently approved as a UV-filter in sunscreens.The tio2 materials used in sunscreen products are reported to be composed of two crystalline types: rutile and anatase or a mixture of the two.
Titanium dioxide is used as a UV filter in sunscreen products to protect the skin from harmful UV rays when exposed to sunlight.Titanium dioxide nanoparticles, used at a concentration up to 25% as a UV filter in sunscreens, can be considered safe for humans after application on a healthy, intact or sunburnt skin.
Titanium dioxide nanoparticles can also act, in certain cases, as a photocatalyst. This means that they can react with UV light (e.g. sun) to accelerate a photoreaction causing oxidation of some biological molecules and generating free radicals.Not all titanium dioxide particles used in cosmetic products have this property. When appropriately coated, the nanoparticles do not remain photocatalysts but still retain their function as a UV filter.
