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chem. Methylene-bis-Benzotriazolyltetramethylbutylphenol, is a yellowish organic solid and practically insoluble in water. The nanomaterial has been approved as a broadband UV filter in cosmetic products in the EU since 2000. It forms a protective film on the upper skin layer and scatters reflects and absorbs the UV rays of the sun, especially UV-A radiation.

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