Chemical name: 2- (2'-Hydroxy-5'-tert-octylphenyl)benzotriazole CAS No.:3147-75-9                            Molecular formula:C20H25N3O Molecular weight:323                                                                                                Appearance: White powder Melting point,℃:103-105 Assay (HPLC), %: ≥99 Ash, %: ≤0.1 Loss on drying, %: ≤0.3 Transmittance   450nm≥98%      500nm≥99%                                                             UV ABSORBER HOSORB-329 is excellent benzotriazole ultraviolet absorbent with effective absorption of ultraviolet radiation in 270-380 nm region. It is suitable for polyester, rigid PVC, PS, PMMA, PC, ABS resin etc. It is particularly suitable for the protection of polycarbonates. In transparent products and high temperature processing of engineering plastics, its effect is excellent. It can also be used for polyolefin.   info at hhochem. com