2-(2H-Benzotriazol-2-yl)-4,6-di-tert-amylphenol
CAS 25973-55-1
EC 247-384-8
Formula C22H29N3O
MW 351.49 g/mol
UV Absorbers & Stabilizers Plastics & PolymersPrinting & PackagingAutomotiveCoatings, Adhesives, Sealants & ElastomersPersonal Care & Cosmetics Antioxidant & StabilizerUV Protection & StabilizationPreservation & Biocide
Description
2-(2H-Benzotriazol-2-yl)-4,6-di-tert-amylphenol, commercially known as UV-328 or Tinuvin 328 (CAS 25973-55-1, EC 247-384-8), is a benzotriazole-class UV absorber with molecular formula C22H29N3O. It carries no assigned E-code and is also referenced under trade designations such as ThasorbUV328 and UV Absorber 328.
In polymer stabilisation, UV-328 absorbs UV radiation in the 300–385 nm range and dissipates it as heat, preventing photodegradation of polyolefins, PVC, and engineering plastics. In industrial coatings and automotive refinish systems, it is combined with HALS to extend film durability and colour retention under prolonged outdoor exposure.
UV-328 is supplied as a solid and is registered under REACH (EC 247-384-8). Procurement teams should note its inclusion on the SVHC candidate list, which affects downstream user obligations within the EU. Standard packaging follows industrial bulk conventions; consult your supplier for available lot sizes and documentation.
In polymer stabilisation, UV-328 absorbs UV radiation in the 300–385 nm range and dissipates it as heat, preventing photodegradation of polyolefins, PVC, and engineering plastics. In industrial coatings and automotive refinish systems, it is combined with HALS to extend film durability and colour retention under prolonged outdoor exposure.
UV-328 is supplied as a solid and is registered under REACH (EC 247-384-8). Procurement teams should note its inclusion on the SVHC candidate list, which affects downstream user obligations within the EU. Standard packaging follows industrial bulk conventions; consult your supplier for available lot sizes and documentation.
Physical Properties
| Melting Point | 84 °C |
| Boiling Point | >180 °C |
| Density | 0.958 g/cm³ |
| Color | Off-White to Pale Yellow |
| Form | Solid |
| Vapor Pressure | 0Pa at 20℃ |
| Log P | 7.3 at 25℃ |
Safety & Handling (Learn More)
Warning GHS08 GHS09
H
H372H373H410H413
P
P260P264P270P273P319P391P501
Trade & Regulatory
| HS Code | 2933.99.8290 |
| Storage Class | 11 - Combustible Solids |
| WGK (Germany) | 2 |
Other Names
2-(benzotriazol-2-yl)-4,6-bis(2-methylbutan-2-yl)phenol2-(2H-benzotriazol-2-yl)-4,6-di-tert-pentylphenolUV-328UV 328Tinuvin 328ThasorbUv328UV ABSORBER 328UV ABSORBER UV-3282-(2H-Benzotriazol-2-yl)-4,6-ditertpentylphenol
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