Description

Benzenepropanoic Acid, 3-(2H-Benzotriazol-2-Yl)-5-(1,1-Dimethylethyl)-4-Hydroxy-, Methyl Ester is a high-performance benzotriazole derivative widely recognized for its exceptional light-stabilizing properties. This compound is critical for protecting polymers and coatings from the degrading effects of ultraviolet (UV) radiation, thereby extending product lifespan and maintaining aesthetic quality. It is an essential additive for manufacturers in the plastics, coatings, and specialty chemical industries seeking to enhance the durability of their formulations.

Application

• Polymer Stabilizer: A primary UV absorber for polyolefins (PP, PE), PVC, polycarbonates, and engineering plastics to prevent photo-oxidation and yellowing.
• Coatings & Paints: Incorporated into automotive, industrial, and architectural coatings to protect against gloss loss, chalking, and color fade.
• Adhesives & Sealants: Used to maintain the integrity and performance of UV-exposed adhesive films and sealant materials.
• Automotive Components: Protects interior and exterior plastic parts, such as dashboards, bumpers, and trim, from sun damage.
• Agricultural Films: Extends the functional life of greenhouse and mulch films by stabilizing them against solar radiation.
• Packaging Materials: Enhances the weatherability of plastic packaging intended for outdoor storage or display.

Basic Information

Product Name	Benzenepropanoic Acid, 3-(2H-Benzotriazol-2-Yl)-5-(1,1-Dimethylethyl)-4-Hydroxy-, Methyl Ester
CAS No.	84268-33-7
Molecular Formula	C20H23N3O3
Molecular Weight	353.42 g/mol
Synonyms	UV-326; Tinuvin 326; 2-(2'-Hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole (Note: This is a common synonym for the related UV-326, but often used interchangeably in industry searches); 3-(2H-Benzotriazol-2-yl)-5-(tert-butyl)-4-hydroxybenzenepropanoic acid methyl ester; Methyl 3-(2H-benzotriazol-2-yl)-5-(tert-butyl)-4-hydroxyhydrocinnamate; Bumetrizole; Light stabilizer 326; Benzotriazole UV absorber 326
EINECS	Contact for details

Quality Control

Our production of Benzenepropanoic Acid, 3-(2H-Benzotriazol-2-Yl)-5-(1,1-Dimethylethyl)-4-Hydroxy-, Methyl Ester adheres to stringent quality management systems to ensure batch-to-batch consistency and high purity. The product is manufactured and tested in facilities that comply with ISO 9001 standards. Comprehensive quality testing includes assay, identification, and impurity profile analysis. Certificates of Analysis (COA) documenting all critical specifications 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 heat sources and incompatible materials. The container should be kept tightly sealed when not in use to minimize exposure to atmospheric moisture.

Specification

Item	Specification
Appearance	Light yellow to off-white crystalline powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 99.0%
Melting Point	138 - 141 °C
Loss on Drying	≤ 0.5%
Residue on Ignition	≤ 0.1%
Transmittance (425 nm / 500 nm)	≥ 95% / ≥ 97%

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