Description

4,4'-Thiobis[2,6-Xylenol] is a high-purity phenolic antioxidant and chemical intermediate. This compound is valued for its ability to act as a highly effective stabilizer and chain terminator in polymer systems, preventing thermal and oxidative degradation. It is primarily required by manufacturers in the polymer, rubber, and specialty chemical industries for producing materials with enhanced longevity and performance under demanding conditions.

Application

• Polymer Stabilizer: A key antioxidant and heat stabilizer for polyolefins (e.g., polyethylene, polypropylene), engineering plastics, and synthetic rubbers to prevent thermal-oxidative degradation during processing and in-service.
• Rubber Industry: Used as a non-staining, non-discoloring antioxidant in the production of white and light-colored rubber goods, such as seals, gaskets, and medical devices.
• Lubricant & Fuel Additive: Functions as an antioxidant additive in industrial lubricants, greases, and fuels to inhibit sludge formation and extend service life.
• Chemical Intermediate: Serves as a versatile building block in organic synthesis for the production of more complex antioxidants, pharmaceuticals, and agrochemicals.
• Adhesives & Sealants: Incorporated to improve the thermal stability and aging resistance of high-performance adhesive and sealant formulations.
• Wire & Cable Insulation: Used as a stabilizer in the plastic and rubber compounds for electrical insulation to protect against heat-induced failure.

Basic Information

Product Name	4,4'-Thiobis[2,6-Xylenol]
CAS No.	18525-99-0
Molecular Formula	C16H18O2S
Molecular Weight	274.38 g/mol
Synonyms	2,2'-Thiobis(4,6-dimethylphenol); 4,4'-Thiobis(2,6-dimethylphenol); Antioxidant 300; Bis(4-hydroxy-3,5-dimethylphenyl) sulfide; Lowinox 44S; 2,6-Dimethyl-4-(2,6-dimethyl-4-hydroxyphenylthio)phenol; Phenol, 4,4'-thiobis[2,6-dimethyl-
EINECS	242-411-6

Quality Control

Our 4,4'-Thiobis[2,6-Xylenol] is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing, including assay, purity, and impurity profile analysis, to ensure it meets the high standards required for industrial and specialty applications. Certificates of Analysis (COA) documenting all key parameters are available upon request.

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 strong oxidizing agents.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 98.0%
Melting Point	158°C - 162°C
Loss on Drying	≤ 0.5%
Residue on Ignition	≤ 0.1%

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