UV absorbent uv-329 is white powder, melting point 101-106℃, soluble in benzene, styrene, ethyl acetate, slightly soluble in ethanol, insoluble in water, it is a light stabilizer with excellent performance and low volatility.


Chemical name : 2- (2'-Hydroxy-5'-tert-octylphenyl)benzotriazole 
Introduction : UV-329 is a benzotriazole type ultraviolet light absorber (UVA), imparting good light stability for plastics and other organic polymers. UV-329 is an effective light stabilizer for a variety of plastics and other organic substrates.

Empirical Formula : C20H25N30

CAS NO : 3147-75-9
Structure :
Physical Properties

Molecular Weight : 323

Appearance : white powder
Melting Range : 103-105 °C
Flashpoint : 150 °C
Specific Gravity(20 °C ) : 1.18g/cm3

            440nm≥ 97 %
            500nm≥ 98%

Solubility At 20 °C (g/100ml solvent)

SolventBenzenestyrenen-heptaneEthyl AcetateEthyl Alcoho (95%)ethylene glycolWater

Applications1. Unsaturated Polyester : 0.2-0.5wt% based on polymer weight2.PVC:Rigid PVC : 0.2-0.5wt% based on polymer weightPlasticized PVC : 0.1-0.3wt% based on polymer weight3.Polyurethane : 0.2-1.0wt% based on polymer weight4.Polyamide : 0.2-0.5wt% based on polymer weight

Packing: 25kg   paper drum or carton