Description

2-(2-Hydroxy-5-tert-Octylphenyl)Benzotriazole is a high-performance ultraviolet (UV) light absorber belonging to the hydroxyphenyl benzotriazole class. This compound is critical for protecting polymers and coatings from photodegradation, thereby extending product lifespan and maintaining aesthetic properties. It is an essential additive for manufacturers in the plastics, paints, and advanced materials industries seeking to enhance the durability of their products against sunlight exposure.

Application

• Polymer Stabilization: Primary UV absorber for polyolefins (PP, PE), PVC, polycarbonates, and engineering plastics to prevent yellowing and embrittlement.
• Coatings and Paints: Used in automotive, industrial, and architectural coatings to protect against gloss loss, chalking, and color fade.
• Adhesives and Sealants: Enhances the weatherability and long-term performance of adhesive films and sealant formulations.
• Agricultural Films: Incorporated into greenhouse and mulch films to stabilize the polymer matrix against solar radiation.
• Synthetic Fibers and Textiles: Protects fibers and fabrics from UV-induced strength loss and degradation.
• Advanced Material Protection: Used in composite materials and specialty films where UV stability is a key performance requirement.

Basic Information

Product Name	2-(2-Hydroxy-5-tert-Octylphenyl)Benzotriazole
CAS No.	123307-21-1
Molecular Formula	C₂₀H₂₅N₃O
Molecular Weight	323.43 g/mol
Synonyms	2-(2-Hydroxy-5-tert-octylphenyl)-2H-benzotriazole; UV-329; Tinuvin 329; 5-tert-Octyl-2-(2H-benzotriazol-2-yl)phenol; 2-(2H-Benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol; Bumetrizole; Norbloc 7966; ADK STAB LA-31
EINECS	Contact for details

Quality Control

Our 2-(2-Hydroxy-5-tert-Octylphenyl)Benzotriazole is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing to ensure it meets precise specifications for purity, melting point, and UV absorption characteristics. A Certificate of Analysis (COA) is provided with each shipment, detailing the results against our stringent quality standards.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to standard
Melting Point	103 - 108 °C
Assay (HPLC)	≥ 99.0 %
Loss on Drying	≤ 0.5 %
Transmittance	≥ 95% (425 nm) ≥ 97% (500 nm)
Ash Content	≤ 0.1 %

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