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.  It  is an effective light stabilizer for a variety of plastics and other organic substrates.
Details:

Molecular formula: C₂₀H₂₅N₃O
CAS NO : 3147-75-9

Properties:

Appearance : white powder

Melting Range : 103-105 °C 

Transmittance (%) : 440nm≥97  500nm≥98
Applications:

1. Unsaturated Polyester : 0.2-0.5wt% based on polymer weight

2.PVC: Rigid PVC : 0.2-0.5wt% based on polymer weight

Plasticized PVC : 0.1-0.3wt% based on polymer weight

3.Polyurethane : 0.2-1.0wt% based on polymer weight

4.Polyamide : 0.2-0.5wt% based on polymer weight
Packing:20 kg (44.1 LB) fiber drum, net weight, with an inner PE liner.