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Ultraviolet Absorber 329 (UV-A)

Ultraviolet Absorber 329 (UV-A)

Chemical Name:2-(2'-Hydroxy-5'-tert-octylphenyl)-benzotriazole

CAS NO.:3147-75-9


UV Absorber 329 is a strong absorber of ultraviolet radiation in the 300-400nm region. It has a low volatility, and especially has good perforin transparent products and high temperature processing engineering plastics.


The product is mainly used for polyolefin, pet, PVC, PP, PS, PC, PP fiber, ABS resin, epoxy resin, resin and ethylene vinyl acetate, etc., to protect the polymer from ultraviolet radiation. It improves the anti-aging properties for film, sheet,molding products, fiber products to maintain its appearance and mechanics performance. It can be used together with phenolic antioxidant, phosphite ester antioxidant and hindered amine light stabilizer. Especially suitable for colorless transparent and light products.


AppearanceOff white powder
Purity %98.5min
Light transmittance (440nm) 97% min
Light transmittance (500nm) 98% min
Melting point ℃103-105.3
Volatiles0.3 max
Ash %0.1 max

Package: 25kg carton inner with plastic bag or as customer’s requirement.

Storage: Keep container tightly closed in a dry and well-ventilated place.