Description

3,3''-Thiobis[4',5-Bis(1,1-Dimethylethyl)[1,1'-Biphenyl]-4-Ol] is a high-performance phenolic antioxidant and sulfur-containing compound, widely recognized for its exceptional efficacy in stabilizing polymers and other organic materials against thermal and oxidative degradation. Its unique molecular structure, featuring two sterically hindered phenolic groups linked by a thioether bridge, provides superior radical scavenging and hydroperoxide decomposing activity. This makes it a critical additive for manufacturers in the plastics, rubber, and lubricant industries seeking to extend product lifespan and maintain performance under demanding conditions. The compound is supplied under CAS No. 57964-01-9.

Application

• Polymer Stabilization: Primary antioxidant for polyolefins (PP, PE), engineering plastics, and synthetic rubbers to prevent thermal-oxidative degradation during processing and long-term service.
• Lubricant & Fuel Additive: Used in engine oils, industrial lubricants, and greases to inhibit oxidation, reduce sludge formation, and extend oil drain intervals.
• Adhesive & Sealant Formulations: Enhances the thermal stability and prevents embrittlement of hot-melt adhesives, sealants, and other polymer-based bonding agents.
• Elastomer Protection: Critical for stabilizing synthetic rubbers like SBR, BR, and NBR against heat aging, maintaining elasticity and mechanical properties.
• Coating Resins: Incorporated into protective coatings and wire & cable insulation compounds to provide long-term oxidative stability.
• Synergistic Blends: Often used in combination with other antioxidants (e.g., phosphites) and light stabilizers to create comprehensive stabilization systems for maximum protection.

Basic Information

Product Name	3,3''-Thiobis[4',5-Bis(1,1-Dimethylethyl)[1,1'-Biphenyl]-4-Ol]
CAS No.	57964-01-9
Molecular Formula	C₃₄H₄₆O₂S
Molecular Weight	518.79 g/mol
Synonyms	2,2'-Thiobis(6-tert-butyl-4-methylphenol) (common name); Antioxidant 300; AO 300; 4,4'-Thiobis(2-tert-butyl-5-methylphenol); Santonox R; 2,2'-Thiobis(4-methyl-6-tert-butylphenol); Bis(2-hydroxy-3-tert-butyl-5-methylphenyl) sulfide; 4,4'-Thiobis(2-tert-butyl-6-methylphenol)
EINECS	261-067-5

Quality Control

Our production of 3,3''-Thiobis[4',5-Bis(1,1-Dimethylethyl)[1,1'-Biphenyl]-4-Ol] adheres to stringent quality management systems to ensure batch-to-batch consistency and high purity. The product undergoes rigorous analytical testing, including HPLC for assay and impurity profiling, to meet exacting customer specifications. A comprehensive Certificate of Analysis (COA) detailing identity, purity, and physical parameters is provided with each shipment. Our quality commitment supports compliance with relevant global standards for polymer additives and industrial chemicals.

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). Due to its nature as an easily oxidized compound, it is recommended to store under an inert atmosphere (e.g., nitrogen) for long-term storage of bulk quantities. Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.0 %
Melting Point	160 - 165 °C
Loss on Drying	≤ 0.5 %
Ash Content	≤ 0.1 %

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