2-(2′-Hydroxy-3′,5′-di-tert-pentylphenyl)-benzotriazole CAS 21615-49-6

What is UV-328 CAS 21615-49-6？ UV-328 is an ultraviolet light absorber (UVA) of the hydroxyphenylbenzotriazole class, which imparts outstanding light stability to plastics and other organic substrates. Application UV-328 is a highly effective light stabilizer for a variety of plastics and other organic substrates. Its use is recommended for the stabilization of styrene homo- and copolymers, acrylic polymers, unsaturated polyesters, polyvinylchloride, polyolefins, polyurethanes, polyacetals, polyvinyl butyral, elastomers, and adhesives. Specification ITEM STANDARD Appearance light yellowish powder or pellet Melting Point (°C) 81 min Ash (%) 0.05 max Volatile matter (%) 0.5 max Transmittance 440 nm (%) 97 min 500 nm (%) 98 min Assay (%) 99.0 min Packaging In 15/20/25/500kg bags/cartons on pallet or fiber drum