Octrizole
CAS 3147-75-9
EC 221-573-5
Formula C20H25N3O
MW 323.43 g/mol
UV Absorbers & Stabilizers Plastics & PolymersPrinting & PackagingCoatings, Adhesives, Sealants & ElastomersAutomotive Antioxidant & StabilizerUV Protection & StabilizationCatalysis
Description
Octrizole (CAS 3147-75-9) is a benzotriazole-class UV absorber sold under trade names including Tinuvin 329, Cyasorb 5411, Sumisorb 340, and Eusorb 323. It carries no assigned E-code and is registered under EC 221-573-5. The compound is also referenced by the abbreviation UV-329 in technical and regulatory documentation.
In polymer and coating formulations, octrizole functions by absorbing UV radiation in the 300–385 nm range and dissipating it as heat, preventing photodegradation of the substrate. It is used in automotive topcoats to protect against paint yellowing and in polyolefin and engineering plastic compounds to extend service life under outdoor exposure.
Octrizole is supplied as a solid and is available in technical and stabilizer grades suited to plastics, coatings, and adhesive applications. It falls under REACH registration requirements within the EU and is classified under HS code 2933997500. Packaging formats vary by supplier; bulk and drum quantities are standard for industrial procurement.
In polymer and coating formulations, octrizole functions by absorbing UV radiation in the 300–385 nm range and dissipating it as heat, preventing photodegradation of the substrate. It is used in automotive topcoats to protect against paint yellowing and in polyolefin and engineering plastic compounds to extend service life under outdoor exposure.
Octrizole is supplied as a solid and is available in technical and stabilizer grades suited to plastics, coatings, and adhesive applications. It falls under REACH registration requirements within the EU and is classified under HS code 2933997500. Packaging formats vary by supplier; bulk and drum quantities are standard for industrial procurement.
Physical Properties
| Melting Point | 104.0-105.2 °C |
| Boiling Point | 471.8±55.0 °C(Predicted) |
| Density | 1.10±0.1 g/cm3(Predicted) |
| Color | White to Off-White |
| Form | Solid |
| Water Solubility | 2μg/L at 20℃ |
| Vapor Pressure | 0Pa at 20℃ |
| Log P | 7.290 (est) |
Safety & Handling (Learn More)
Warning GHS07
H
H315H319H335H412
P
P261P264P271P273P280P319P321P405P501P264+P265P302+P352P304+P340P332+P317P337+P317P362+P364P403+P233P305+P351+P338
Trade & Regulatory
| HS Code | 2933997500 |
| Storage Class | 11 - Combustible Solids |
| WGK (Germany) | 1 |
Other Names
2-(benzotriazol-2-yl)-4-(2,4,4-trimethylpentan-2-yl)phenolUV-329EUSORB 323TINUVIN 329Cyasorb 5411Sumisorb 340Cyasorb UV 5411Spectra-Sorb UV 5411
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