Description

Uv-320 CAS NO 3846-71-7 is a high-performance ultraviolet light absorber belonging to the benzotriazole class of compounds. This additive is critical for protecting polymers and coatings from the degrading effects of UV radiation, thereby extending product lifespan and maintaining aesthetic properties. It is an essential component for manufacturers in the plastics, paints, and advanced materials industries who require reliable photostabilization for their formulations.

Application

• Polymer Stabilization: Primary UV absorber for polyolefins (PP, PE), PVC, polycarbonates, and engineering plastics to prevent yellowing, embrittlement, and loss of mechanical strength.
• Coatings and Paints: Incorporated into automotive coatings, industrial paints, and wood varnishes to protect against gloss loss, chalking, and color fade.
• Adhesives and Sealants: Enhances the durability and weatherability of adhesive films and sealant compounds exposed to sunlight.
• Automotive Components: Used in interior and exterior plastic parts, such as dashboards, bumpers, and trim, to ensure long-term color and physical integrity.
• Agricultural Films: Protects greenhouse films and mulch films from UV-induced degradation, extending their functional service life.
• Synthetic Fibers and Textiles: Imparts UV resistance to fibers, fabrics, and technical textiles, improving their outdoor performance.

Basic Information

Product Name	Uv-320
CAS No.	3846-71-7
Molecular Formula	C₁₇H₁₈N₃O
Molecular Weight	280.35 g/mol
Synonyms	2-(2'-Hydroxy-3',5'-di-tert-amylphenyl)benzotriazole; UV-320; 2-(2H-Benzotriazol-2-yl)-4,6-di-tert-pentylphenol; Tinuvin 328; BLS 5411; 2-(3',5'-Di-tert-amyl-2'-hydroxyphenyl)benzotriazole; Benzotriazole UV Absorber 328; Light Stabilizer 328
EINECS	223-346-6

Quality Control

Our Uv-320 is produced under a stringent quality management system to ensure batch-to-batch consistency and high purity. We provide comprehensive Certificates of Analysis (COA) for every shipment, detailing key parameters such as assay, melting point, and UV absorbance. Our quality protocols are designed to meet the demanding requirements of the polymer additive industry.

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). This product is hygroscopic (moisture-sensitive); keep the container tightly sealed when not in use to minimize exposure to atmospheric humidity.

Specification

Item	Specification
Appearance	Light yellow to off-white powder or crystals
Identification (IR)	Conforms to standard
Melting Point	80 - 86 °C
Assay (HPLC)	≥ 98.5 %
Volatile Matter	≤ 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.