Description

3,4',5-Tris(1,1-Dimethylethyl)[1,1'-Biphenyl]-4-Ol is a sterically hindered phenolic compound, valued for its role as a high-performance antioxidant and stabilizer in polymer systems. Its molecular structure provides excellent thermal and oxidative stability, making it critical for extending the service life of sensitive materials. This product is essential for formulators and manufacturers in the plastics, rubber, and specialty chemical industries seeking to prevent degradation and maintain product integrity.

Application

• Polymer Stabilizer: Primary antioxidant for polyolefins (e.g., PP, PE), engineering plastics, and synthetic rubbers to inhibit thermal-oxidative degradation during processing and end-use.
• Additive in Lubricants & Fuels: Used in industrial lubricants, greases, and fuel formulations to prevent gum formation and oxidative breakdown, enhancing performance longevity.
• Intermediate for Specialty Chemicals: Serves as a key building block in the synthesis of more complex antioxidants, UV stabilizers, and other functional additives.
• Elastomer Protection: Imparts aging resistance to various elastomeric products, including seals, gaskets, and automotive components.
• Adhesive & Sealant Formulations: Incorporated to improve the shelf-life and durability of high-performance adhesives and sealants by preventing resin degradation.

Basic Information

Product Name	3,4',5-Tris(1,1-Dimethylethyl)[1,1'-Biphenyl]-4-Ol
CAS No.	6257-39-2
Molecular Formula	C26H38O
Molecular Weight	366.58 g/mol
Synonyms	4-Hydroxy-3,4',5-tri-tert-butylbiphenyl; 3,4',5-Tri-tert-butyl-4-biphenylol; 4-Biphenylol, 3,4',5-tris(1,1-dimethylethyl)-; Phenol, 3,4',5-tris(1,1-dimethylethyl)-1,1'-biphenyl-4-yl; Antioxidant 300; AO 300; Tris(tert-butyl)biphenylol; Light Stabilizer 300
EINECS	228-408-6

Quality Control

Our 3,4',5-Tris(1,1-Dimethylethyl)[1,1'-Biphenyl]-4-Ol is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing, including HPLC for assay and purity, to ensure it meets precise specifications and consistent performance. Certificates of Analysis (COA) are provided with each shipment, and we support compliance with relevant global regulatory frameworks.

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 flames. The product is light-sensitive and should be stored away from light to maintain stability.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.0%
Melting Point	185 - 190 °C
Loss on Drying	≤ 0.5%
Heavy Metals	≤ 20 ppm

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