UV Absorber 326

UV Absorber 326

UV Absorber 326 is a benzotriazole-type ultraviolet absorber, referred to below as light stabilizer 326. It is mainly used to protect plastic materials and coatings so that they do not degrade after being irradiated with ultraviolet light.

Chemical name: 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole

Application range: UV Absorber 326 is mainly used in polyolefins, cold-curing polyesters and wood varnishes.

Performance advantages: UV Absorber 326 can be used widely in polyolefins (with indirect food contact). It has low volatility at high temperature and strong resistance to thermal degradation, and shows no significant loss or decomposition during the compounding and processing of polyolefins. In UV-protection applications for polyester resins, light stabilizer 326 does not react with metal salts during resin curing to form colored by-product contamination.

Physical propertyValue
Melting range138 ~ 141 ℃
Flash point238 ℃
Density (20 ℃)1.32 g/cm3
Vapour pressure (20 ℃)7.5E-7 Pa
Bulk density130 – 200 g/l
Solubility / miscibility (20 ℃), % w/w
Acetone1
Chloroform11
Ethanol-
Ethyl acetate2
n-Hexane1
Methanol0.1
Dichloromethane9
Toluene-
  
Volatility (pure substance, TGA data, heating rate 20 ℃/min, in air)
Temperature ℃Weight loss %
1250.3
1500.4
1750.5
2001.0
2253.5
25012.1
27535.1
Technical reviewTiangang Technical CenterVersion2026-11-07
Specifications and application notes on this page are compiled from Tiangang's published technical data. Actual values are governed by the COA shipped with each lot and the technical agreement confirmed by both parties.

Certifications

  • National High-Tech Enterprise
  • Vice Chairman Unit, China Plastics Processing Industry Association (CPPIA)
  • Vice Chairman Unit, Agricultural Plastics Branch, China Agricultural Plastics Application Technology Society
  • Member, Ageing Methods Subcommittee, National Technical Committee on Plastics (SAC/TC15/CS5)
  • Member, Society of the Plastics Industry (SPI), USA

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