Description

Octyl 3-[3-tert-Butyl-4-Hydroxy-5-(5-Chloro-2H-Benzotriazol-2-Yl)Phenyl]Propionate is a high-performance, light-stabilizing additive belonging to the hydroxyphenyl benzotriazole class of UV absorbers. It is engineered to provide exceptional long-term protection for polymers and coatings against photodegradation caused by ultraviolet radiation. This compound is essential for formulators and manufacturers in the plastics, paints, and coatings industries who require reliable stabilization to extend product lifespan and maintain aesthetic properties under harsh environmental conditions.

Application

This UV absorber is widely utilized across industries where material durability against sunlight is critical. Key application areas include:

• Polymer Stabilization: Primary use in polyolefins (PP, PE), PVC, polycarbonates, and polyurethanes to prevent yellowing, cracking, and loss of mechanical strength.
• Automotive & Industrial Coatings: Incorporated into automotive clear coats, refinish paints, and industrial coatings to enhance gloss retention and prevent chalking.
• Construction Materials: Used in plastic building profiles, siding, window frames, and roofing membranes for weatherability.
• Adhesives & Sealants: Protects cured adhesives and sealants from UV-induced degradation, maintaining bond integrity.
• Packaging Films: Added to plastic films and sheets to protect both the packaging material and light-sensitive contents.
• Synthetic Fibers & Textiles: Imparts UV resistance to fibers, outdoor fabrics, and artificial turf.

Basic Information

Product Name	Octyl 3-[3-tert-Butyl-4-Hydroxy-5-(5-Chloro-2H-Benzotriazol-2-Yl)Phenyl]Propionate
CAS No.	83044-89-7
Molecular Formula	C₂₈H₃₈ClN₃O₃
Molecular Weight	500.08 g/mol
Synonyms	UV-329; Octrizole; 2-(2'-Hydroxy-5'-tert-octylphenyl)benzotriazole; 5-Chloro-2-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol; 2-(3'-tert-Butyl-2'-hydroxy-5'-methylphenyl)-5-chlorobenzotriazole; 2-(2H-Benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)-6-(1-methyl-1-phenylethyl)phenol (related); Bis(1,2,2,6,6-pentamethyl-4-piperidyl) sebacate (common co-stabilizer)
EINECS	Contact for details

Quality Control

Our production of Octyl 3-[3-tert-Butyl-4-Hydroxy-5-(5-Chloro-2H-Benzotriazol-2-Yl)Phenyl]Propionate adheres to a stringent quality management system. Every batch undergoes comprehensive analytical testing to ensure high purity, consistent performance, and compliance with relevant industry specifications. Certificates of Analysis (COA) detailing purity, identity, and key physical parameters are available upon request to support your quality assurance protocols.

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 and heat sources. Under these conditions, the product remains stable for extended periods.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 98.5%
Melting Point	102 - 108 °C
Loss on Drying	≤ 0.5%
Ash Content	≤ 0.1%
Transmittance (425 nm / 500 nm)	≥ 97% / ≥ 98%

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