From Wikipedia, the free encyclopedia
Preferred IUPAC name
Other names
2-(2H-Benzotriazol-2-yl)-4,6-di-tert-pentylphenol; Tinuvin-328; UV-328
3D model (JSmol)
ECHA InfoCard 100.043.062 Edit this at Wikidata
EC Number
  • 247-384-8
  • InChI=1S/C22H29N3O/c1-7-21(3,4)15-13-16(22(5,6)8-2)20(26)19(14-15)25-23-17-11-9-10-12-18(17)24-25/h9-14,26H,7-8H2,1-6H3
  • CCC(C)(C)C1=CC(=C(C(=C1)N2N=C3C=CC=CC3=N2)O)C(C)(C)CC
Molar mass 351.494 g·mol−1
Appearance Solid
Melting point 80-86 °C[1]
< 0,001 g·l−1 (20 °C)[1]
GHS labelling:
GHS07: Exclamation mark
H373, H413
P260, P273, P314, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

UV-328 (2-(2H-benzotriazol-2-yl)-4,6-di-tert-pentylphenol) is a chemical compound that belongs to the phenolic benzotriazoles. It is a UV filter that is used as an antioxidant for plastics.[2]


UV-328 has a melting point of 80-86 °C, a vapor pressure of 4,6·10−5 Pa (20 °C) and a water solubility of < 0,001 g·l−1 (20 °C).[1]


UV-328 is a light stabilizer for a variety of plastics and other organic substrates. Its use is recommended for the stabilization of styrene homopolymers and copolymers, acrylic polymers, unsaturated polyesters, polyvinyl chloride, polyolefins, polyurethanes, polyacetals, polyvinyl butyral, elastomers and adhesives.[3] It protects polymers and organic pigments from UV radiation and helps maintain the original appearance and physical integrity of moldings, films, sheets and fibers during outdoor weathering. The application concentration is 0.1-1 %.[3]

UV-328 is recommended for applications such as automotive coatings, industrial coatings, commercial inks such as wood stains or do-it-yourself inks.[4]


UV-328 is persistent, bioaccumulative and toxic (PBT) as well as very persistent and very bioaccumulative (vPvB). Thus, it is in the list of substances of very high concern.[5] It may cause long lasting harmful effects to aquatic life.[6]

UV-328 has been found to be associated with adverse health effects in mammals based on repeated-dose toxicity studies conducted in rats and dogs, with the primary health effect being liver toxicity. It is also associated with adverse effects on the kidney based on the study in rats.[7]

The finding of UV-328 in plastics sampled on remote beaches,[8] in stomachs of seabirds[9] and in preen gland oil[10][11] show that it is also transported over long distances and is taken up by biota.[12] Detections in Arctic biota include eggs of common eider, kittiwake, European shag and glaucous gull as well as the livers of mink.[13]


  1. ^ a b c Wypych, Anna (2015-07-08). Databook of UV Stabilizers. Elsevier. ISBN 9781927885031.
  2. ^ "2-(2H-Benzotriazol-2-yl)-4,6-di-tert-pentylphenol". www.trc-canada.com. Retrieved 2019-05-28.
  3. ^ a b "Ciba® TINUVIN® 328 Benzotriazole UV Absorber" (PDF).
  4. ^ "Ciba® TINUVIN® 328 Light Stabiliser" (PDF). Ciba Speciality Chemicals.
  5. ^ "Candidate List of substances of very high concern for Authorisation - ECHA". echa.europa.eu. Retrieved 2019-05-28.
  6. ^ "Classifications - CL Inventory". echa.europa.eu. Retrieved 2020-12-24.
  7. ^ https://echa.europa.eu/documents/10162/17233/rac_opinion_uv-320-328_en.pdf/34ab1637-2db8-456c-b19c-918db4c99395[bare URL PDF]
  8. ^ Tanaka, Kosuke; Takada, Hideshige; Ikenaka, Yoshinori; Nakayama, Shouta M. M.; Ishizuka, Mayumi (2020-01-01). "Occurrence and concentrations of chemical additives in plastic fragments on a beach on the island of Kauai, Hawaii". Marine Pollution Bulletin. 150: 110732. doi:10.1016/j.marpolbul.2019.110732. ISSN 0025-326X. PMID 31757391. S2CID 208233759.
  9. ^ Tanaka, Kosuke; van Franeker, Jan A.; Deguchi, Tomohiro; Takada, Hideshige (August 2019). "Piece-by-piece analysis of additives and manufacturing byproducts in plastics ingested by seabirds: Implication for risk of exposure to seabirds". Marine Pollution Bulletin. 145: 36–41. doi:10.1016/j.marpolbul.2019.05.028. ISSN 1879-3363. PMID 31590798. S2CID 181809194.
  10. ^ Tanaka, Kosuke; Watanuki, Yutaka; Takada, Hideshige; Ishizuka, Mayumi; Yamashita, Rei; Kazama, Mami; Hiki, Nagako; Kashiwada, Fumika; Mizukawa, Kaoruko; Mizukawa, Hazuki; Hyrenbach, David (February 2020). "In Vivo Accumulation of Plastic-Derived Chemicals into Seabird Tissues". Current Biology. 30 (4): 723–728.e3. doi:10.1016/j.cub.2019.12.037. ISSN 0960-9822. PMID 32008901. S2CID 210957031.
  11. ^ Yamashita, Rei; Hiki, Nagako; Kashiwada, Fumika; Takada, Hideshige; Mizukawa, Kaoruko; Hardesty, Britta Denise; Roman, Lauren; Hyrenbach, David; Ryan, Peter G.; Dilley, Ben J.; Muñoz-Pérez, Juan Pablo (2021). "Plastic additives and legacy persistent organic pollutants in the preen gland oil of seabirds sampled across the globe". Environmental Monitoring and Contaminants Research. 1: 97–112. doi:10.5985/emcr.20210009. S2CID 241803983.
  12. ^ Andrade, Helena; Glüge, Juliane; Herzke, Dorte; Ashta, Narain Maharaj; Nayagar, Shwetha Manohar; Scheringer, Martin (2021-07-22). "Oceanic long-range transport of organic additives present in plastic products: an overview". Environmental Sciences Europe. 33 (1): 85. doi:10.1186/s12302-021-00522-x. hdl:11250/2767248. ISSN 2190-4715. S2CID 236163411.
  13. ^ Schlabach; et al. (2019). "Screening program 2018: Volatiles, Gd, BADGE, UV filters, Additives, and Medicines" (PDF). NILU, NIVA.{{cite web}}: CS1 maint: url-status (link)