CAS No. [2440-22-4]
Chemical name: 2-(2’-hydroxy-5’-methylphenyl)benzotriazole
Molecular formula: C₁₃H₁₁N₃O
Molecular weight: 225.3
Specification:
      Appearance: white to light yellow powder
      Assay: 99% min.
      Melting point: 128.0-132.0°C
      Loss on drying: 0.5% max.
      Ash: 0.1% max.
      Transmittance:
            at 440nm:  97% min.
            at 500nm:  98% min.
Packing: 20/25kg fiber drum
Usage:
As the ultraviolet absorption agent, it is available to polyester, epoxy, cellulose acetate, PVC, polystyrene, plexiglass and polyacrylonitrile resin etc. The maximum absorbing wavelength range is 270-380nm.

Molecular structure: