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Tiangang® UV-234

Low Volatile Benzotriazole UV Absorber

Chemical name 2-(2H-benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol
CAS number 70321-86-7
Molecular Weight 447.6 g/mol
Description Tiangang® UV-234 is a highly effective UV absorber for polymers processed at high temperatures such as polycarbonate, polyesters, polyacetal, polyamides, polyphenylene sulfide, polyphenylene oxide, aromatic copolymers, thermoplastic polyurethane and polyurethane fibers, where loss of UVA is not tolerated. It protects organic polymers as well as pigments from UV light, improving and preserving the technical and visual performance of such applications. Tiangang® Tiangang® UV-234 features low volatility, exceptional light absorbing characteristics and good compatibility in various substrates. This makes the product especially suitable for applications characterized by high surface area, such as films and fiber.
Dosage level of Tiangang® UV-234 is between 0.10 and 0.60%, 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-234 Slightly yellow powder 137-141 280 > 150

Solubility @ 20oC (g/100 ml solvent)

Tiangang® UV-234 Acetone Chloroform Ethanol Ethyl acetate n-Hexane Methanol Water
2 35 0.3 4 0.6 < 0.1 < 0.01

Safety & handling

Tiangang® UV-234 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.