Chemical name: 2-(2'-Hydroxy-3', 5'-di-tert-amylphenyl) benzotriazole CAS No.:25973-55-1 Molecular formula:C22H29N3O Molecular weight:351.5 Appearance: Slightly yellow powder Assay (HPLC), %: ≥ 99 Melting point,℃:80-88 Ash, %: ≤0.1 Loss on drying, %: ≤ 0.5 Transmittance 460nm≥96% 500nm≥97% Application  UV ABSORBER HOSORB-328 is a benzotriazole UV absorber with strong absorption of ultraviolet radiation in the 300-400nm region. It offers excellent light stability to organic substance, good compatibility and outstanding solubility in plastics. It is used in the light stabilization of a wide range of plastics, including polyolefins, polyurethanes, PVC, acrylics, styrenic polymers, unsaturated polyesters, and others. It is also useful in the light stabilization of adhesives and solvent-based coatings.  info at hhochem. com