CAS No. [3864-99-1]
Chemical name: 2-（2’-Hydroxy-3’,5’-di-tert-butylphenyl-5-chlorobenzotriazole
Molecular formula: C₂₀H₂₄N₃OCl
Molecular weight: 357.9
Specification:
      Appearance: light yellow powder
      Assay: 99% min.
      Melting point: 154.0-158.0 deg C
      Loss on drying: 0.5% max.
      Ash: 0.1% max.
      Transmittance:
            at 460nm:  97% min.
            at 500nm:  98% min.
Packing: 20/25kg fibre drum
Usage:
      As the ultraviolet absorption agent, it is available to polyolefine. It is also availabe to PVC, Polycarbonate, polyurethane, plexiglass and many kinds of paint. The maximum absorbing wavelength range is 270-380nm.

Molecular structure: