Description

2-(2-Hydroxy-4-Octyloxyphenyl)-[2H]-Benzotriazole is a high-performance, oil-soluble ultraviolet (UV) light absorber belonging to the hydroxyphenyl benzotriazole class. This compound is critical for providing exceptional long-term protection to polymers and coatings by absorbing harmful UV radiation and preventing photo-degradation. It is an essential additive for manufacturers in the plastics, coatings, and synthetic fiber industries who require reliable stabilization against yellowing, embrittlement, and loss of mechanical properties.

Application

This UV absorber is widely used across industries to enhance the durability and lifespan of materials exposed to sunlight and artificial UV sources.

• Polymer Stabilization: Primary use in polyolefins (PP, PE), PVC, polycarbonates, polyesters, and engineering plastics to prevent photo-oxidation.
• Coatings and Paints: Incorporated into automotive coatings, industrial paints, wood finishes, and architectural coatings to protect against gloss loss, chalking, and color fade.
• Adhesives and Sealants: Used to maintain the integrity and adhesive properties of UV-exposed sealants and adhesives.
• Synthetic Fibers: Applied in the production of UV-stable fibers for outdoor textiles, awnings, and geotextiles.
• Agricultural Films: Added to greenhouse films and mulch films to extend their functional lifetime under intense solar exposure.
• Packaging Materials: Protects plastic packaging from UV-induced degradation, preserving the contents and package appearance.

Basic Information

Product Name	2-(2-Hydroxy-4-Octyloxyphenyl)-[2H]-Benzotriazole
CAS No.	3147-77-1
Molecular Formula	C20H25N3O2
Molecular Weight	339.43 g/mol
Synonyms	UV-329; Octrizole; 2-(2'-Hydroxy-5'-octyloxyphenyl)benzotriazole; 2-(2H-Benzotriazol-2-yl)-4-(octyloxy)phenol; Bumetrizole; Tinuvin 329; Cyasorb UV 5411; Norbloc 7966; 2-(3',5'-Di-tert-butyl-2'-hydroxyphenyl)-5-chlorobenzotriazole (Note: This is a different, common benzotriazole, often listed erroneously); Phenol, 2-(2H-benzotriazol-2-yl)-4-(octyloxy)-
EINECS	221-573-5

Quality Control

Our production of 2-(2-Hydroxy-4-Octyloxyphenyl)-[2H]-Benzotriazole adheres to stringent quality management systems. Every batch undergoes rigorous analytical testing, including HPLC, GC, and spectroscopic methods, to ensure high purity and consistent performance. We provide comprehensive Certificates of Analysis (COA) with each shipment, detailing key parameters such as assay, melting point, and UV absorbance. Our quality commitment supports compliance with relevant global standards for polymer additives.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from heat, sparks, and open flame. The product is light-sensitive (store away from light).

Specification

Item	Specification
Appearance	Light yellow to off-white crystalline powder
Identification (IR)	Conforms to structure
Melting Point	103 - 108 °C
Assay (HPLC)	≥ 99.0 %
UV Absorbance (λ max)	Conforms
Loss on Drying	≤ 0.5 %
Residue on Ignition	≤ 0.1 %
Transmittance	≥ 95% (425 nm) / ≥ 97% (500 nm)

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.