Octrizole
CAS Number
3147-75-9
EC Number
221-573-5
What is Octrizole?
Octrizole (CAS 3147-75-9), also marketed as UV-329 and Tinuvin 329, is a benzotriazole-class UV absorber used to protect organic substrates from photodegradation.
Where is Octrizole used?
- Automotive coatings and OEM clearcoats: extends exterior durability by blocking UV wavelengths responsible for polymer chain scission and gloss loss
- Plastics: incorporated into polyolefins, engineering resins and film extrusion for long-term weathering specifications
- Adhesives and sealants: maintains bond integrity and elasticity under prolonged sunlight
- Printing inks and flexible packaging laminates: limits UV-induced yellowing and substrate degradation
- It functions by selectively absorbing ultraviolet radiation and dissipating it as heat.
Commercial specifications
- Purity typically 99% minimum
- Packaging from kilogram-scale bags to bulk quantities
Other Names (Synonyms)
UV-329|2-(2-Hydroxy-5-tert-octylphenyl)benzotriazole|Tinuvin 329|Cyasorb 5411|2-(2H-Benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol|Cyasorb UV 5411|Sumisorb 340|2-Benzotriazolyl-4-tert-octylphenol
What are the physical properties of Octrizole?
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)
How is Octrizole classified and handled safely? Learn More
Warning
GHS07· Irritant
Hazard Statements
H315 Causes skin irritation
H319 Causes serious eye irritation
H335 May cause respiratory irritation
H412 Harmful to aquatic life with long lasting effects
Precautionary Statements
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P264 Wash … thoroughly after handling.
P271 Use only outdoors or in a well-ventilated area.
P273 Avoid release to the environment.
Which trade and regulatory codes apply to Octrizole?
HS Code 2933997500
Storage Class 11 - Combustible Solids
WGK (Germany) 1