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Tiangang® UV-326

Benzotriazole UV Absorber 

Chemical name Phenol, 2-(5-chloro-2H-benzotriazole-2-yl)-6-(1,1-dimethylethyl)-4-methyl-
CAS number 3896-11-5
Molecular Weight 315.8 g/mol
Description Tiangang® UV-326 is a UV absorber suitable for a variety of plastics and other organic substrates, especially polyolefins, and cold cured polyesters. It has a wide range of indirect food approvals in polyolefins. It features strong UV absorption, and 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-326 is between 0.10 and 0.50%, 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-326 Slightly yellow powder 138 ~ 141 215 238

Solubility @ 20oC (g/100 ml solvent)

Tiangang® UV-326 Acetone Chloroform Ethanol Ethyl acetate n-Hexane Methanol Water
1 11 - 2 1 0.1 < 0.01

Safety & handling

Tiangang® UV-326 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.