Description

4,4'-Thiobis[2,5-Xylenol] is a high-purity phenolic antioxidant and chemical intermediate. This compound is valued for its ability to act as a stabilizer and chain terminator in polymer systems, preventing oxidative degradation. It is primarily utilized by manufacturers in the polymer, rubber, and specialty chemical industries seeking to enhance product longevity and performance under thermal stress.

Application

• Polymer Stabilizer: Acts as an antioxidant and heat stabilizer in polyethylene, polypropylene, and other polyolefins to prevent thermal and oxidative degradation during processing and service life.
• Rubber Additive: Used in the production of synthetic rubbers and elastomers to inhibit aging and maintain mechanical properties.
• Chemical Intermediate: Serves as a key building block in the synthesis of more complex antioxidants, UV stabilizers, and specialty phenolic resins.
• Lubricant & Grease Additive: Incorporated into industrial lubricants and greases to improve oxidative stability and extend operational life.
• Adhesive & Sealant Formulations: Enhances the thermal stability and durability of high-performance adhesives and sealants.

Basic Information

Product Name	4,4'-Thiobis[2,5-Xylenol]
CAS No.	79718-64-2
Molecular Formula	C16H18O2S
Molecular Weight	274.38 g/mol
Synonyms	2,2'-Thiobis(4,6-dimethylphenol); 4,4'-Thiobis(2,5-dimethylphenol); Bis(2-hydroxy-3,5-dimethylphenyl) sulfide; Antioxidant 736; Lowinox® 44S; Phenol, 4,4'-thiobis[2,5-dimethyl-; AO 44S
EINECS	Contact for details

Quality Control

Our 4,4'-Thiobis[2,5-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 precise customer specifications and industry standards. Certificates of Analysis (COA) documenting these results are provided with each shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). This material is easily oxidized; prolonged storage under an inert atmosphere (e.g., nitrogen) is recommended for optimal long-term stability. Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Melting Point	155 - 160 °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.