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UV-328(Benzotriazole UV Absorber )CAS: 25973-55-1

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Synonyms: 2-(2-Hydroxy-3,5-dipenryl-phenyl) benzotriazole; 2-(2H-benzotriazol-2-yl)-4,6-bis(1,1-dimethylpropyl)-phenol; 2-(2H-hydroxy-3-5-Di-tert-Amyllphenyl)benzotriazole; UV-328; Tinuvin 328; Primesorb328; Ultraviolet absorbent UV-328; 2-(2'-Hydroxy-3',5'-di-tert-Pentyl Phenyl)-Benzotriazole; BHSORB-328; 2-(2'-Hydroxy-3',5-dipenryl-phenyl) benzotriazole; UV absorber-328; Classification: Other Chemicals
EINECS: 247-384-8 Molecular Formula: C22H29N3O
Melting Point: 80-83℃ Boiling Point: 469.1°C at 760 mmHg
Stability: Water Solubility: Insoluble AUTOIGNITION
Refractive index: 1.575 Flash Point: 229 C
Purity: Appearance: Slightly yellowish powder
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 UV-328(Benzotriazole UV Absorber )

Chemical name : 2-(2'-Hydroxy-3', 5'-di-tert-amylphenyl) benzotriazole
Introduction: UV-328 is a benzotriazole type ultraviolet light absorber (UVA), imparting good light stability for plastics and other organic polymers. it protects polymers as well as organic pigments from UV radiation helping to preserve the original appearance and physical integrity of molded articles, films, sheets, and fibers during outdoor weathering.
Molecular formula: C22H29N30
CAS NO : 25973-55-1
Structure :

Appearance : slight yellow powder  Melting Range : 80-88 °C  

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

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


UV-328 is available in powder form in a 25kg fiber drum or 25kg carton with an inner PE liner. 


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