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Tiangang® UV-328

High Efficiency Benzotriazole UV Absorber

Chemical name 2-(2H-benzotriazol-2-yl)-4,6-ditertpentylphenol
CAS number 25973-55-1

Molecular Weight 351.5 g/mol
Description Tiangang® UV-328 is a highly efficient UV absorber for a variety of plastics and other organic substrates, including polyolefins, and most engineering plastics, as well as PVC, PMMA, PU, PET, POM, polyesters, and various elastomers, and adhesives. Tiangang® UV-328 features strong UV absorption, low initial color, excellent compatibility, and moderately low volatility. When added to the substrates, it protects the substrate from UV degradation, preserving the original appearance and physical integrity of molded articles, films, sheets, and fibers during outdoor use.
Dosage level of Tiangang® UV-328 is between 0.10 and 1.0%, depending on substrate and performance requirements. When used in combination with Tiangang® series of Hindered Amine light stabilizers (HALS), synergistic performance is often observed.

Typical properties

  Appearance Melting range
2% weight loss, oC
Flash point
Tiangang® UV-328 Slightly yellow powder 80 ~ 88 202 229

Solubility @ 20oC (g/100 ml solvent)

Tiangang® UV-328 Acetone Chloroform Cyclohexane Ethyl acetate n-Hexane Methanol Water
6 44 15 16 16 0.4 < 0.01

Safety & handling

Tiangang® UV-328 The use of proper protective equipment is recommended. Excess exposure to the product should be avoided. Wash thoroughly after handling. Store the product in a cool, dry, well-ventilated area away from incompatible materials.


The information supplied is presented in good faith and has been derived from sources believed to be reliable. Since conditions of use are beyond our control, all risks are assumed by the user. No representation is expressed or implied, and nothing herein shall be construed as permission or recommendation to practice a patented invention without license.