Description

4,4'-Thiobis[5-tert-Butyl-m-Cresol] is a high-performance phenolic antioxidant widely recognized for its excellent heat stability and low volatility. This compound is critical for preventing oxidative degradation and extending the service life of polymers and synthetic materials. It is an essential additive for manufacturers in the plastics, rubber, and lubricant industries seeking to enhance product durability under demanding thermal conditions.

Application

• Polymer Stabilization: Primary antioxidant for polyolefins (PP, PE), polyamides, and other engineering plastics to prevent thermal-oxidative degradation during processing and end-use.
• Rubber Industry: Used in the production of synthetic rubbers (SBR, BR, NBR) and latex to protect against heat aging and maintain elasticity.
• Lubricants & Greases: Antioxidant additive in industrial lubricants, transmission fluids, and greases to inhibit oil thickening and deposit formation at high temperatures.
• Adhesives & Sealants: Enhances the thermal stability and longevity of hot-melt adhesives, pressure-sensitive adhesives, and various sealant formulations.
• Petroleum Products: Stabilizer for fuels and hydrocarbon-based products to prevent gum formation and oxidative degradation.
• Elastomers & Fibers: Protects synthetic fibers and elastomeric materials from UV and heat-induced brittleness and discoloration.

Basic Information

Product Name	4,4'-Thiobis[5-tert-Butyl-m-Cresol]
CAS No.	3818-54-0
Molecular Formula	C22H30O2S
Molecular Weight	358.54 g/mol
Synonyms	2,2'-Thiobis(6-tert-butyl-4-methylphenol); Antioxidant 300; 4,4'-Thiobis(2-tert-butyl-5-methylphenol); Bis(3-tert-butyl-4-hydroxy-6-methylphenyl) sulfide; Lowinox® 300; Irganox® 1081; Santonox® R; AO 300; 6,6'-Di-tert-butyl-4,4'-thiodi-o-cresol
EINECS	223-285-8

Quality Control

Our production of 4,4'-Thiobis[5-tert-Butyl-m-Cresol] adheres to stringent quality management protocols to ensure batch-to-batch consistency and high purity. The material is manufactured and tested in compliance with relevant industry standards. A comprehensive Certificate of Analysis (COA) detailing purity, assay, and impurity profiles is provided with each shipment to guarantee it meets your specific technical requirements.

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 product is light-sensitive and should be stored in its original packaging or an opaque container.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0 %
Melting Point	158 - 162 °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.