Description

4,4'-Thiobis[6-tert-Butyl-2,3-Xylenol] is a high-performance phenolic antioxidant widely used to inhibit oxidative degradation in various polymeric systems. Its primary value lies in its ability to provide excellent long-term thermal stability, preventing discoloration and maintaining the physical properties of materials under demanding conditions. This compound is essential for manufacturers in the plastics, rubber, and synthetic fiber industries who require reliable protection against oxidative chain scission and embrittlement. Its compatibility with a range of polymers makes it a versatile additive for enhancing product lifespan and performance.

Application

• Primary antioxidant for polyolefins such as polyethylene (PE) and polypropylene (PP) to prevent thermal-oxidative degradation during processing and end-use.
• Stabilizer for engineering plastics and synthetic fibers, including polyamides and polyesters, to maintain tensile strength and color.
• Additive in rubber compounds for tires, seals, and hoses to protect against heat aging and ozone cracking.
• Stabilizing component in adhesives, sealants, and coatings to ensure shelf-life and durability.
• Used in food-grade polymer applications where compliant antioxidant additives are required (subject to specific regulatory approvals).
• Synergistic component in antioxidant blends with phosphites or thioesters for enhanced stabilization performance.
• Protective additive for hydrocarbon-based fluids and lubricants to inhibit sludge formation.

Basic Information

Product Name	4,4'-Thiobis[6-tert-Butyl-2,3-Xylenol]
CAS No.	94021-13-3
Molecular Formula	C22H30O2S
Molecular Weight	358.54 g/mol
Synonyms	2,2'-Thiobis(6-tert-butyl-4-methylphenol); Antioxidant 300; Lowinox® 300; AO 300; 4,4'-Thiobis(2-tert-butyl-5-methylphenol); Bis(6-tert-butyl-2-hydroxy-3-methylphenyl) Sulfide; Phenol, 4,4'-thiobis[2-(1,1-dimethylethyl)-6-methyl-]; Santowhite® TBMC
EINECS	Contact for details

Quality Control

Our production of 4,4'-Thiobis[6-tert-Butyl-2,3-Xylenol] adheres to strict quality management protocols to ensure batch-to-batch consistency and high purity. Each lot is analyzed against comprehensive specifications using advanced techniques like HPLC and GC. Certificates of Analysis (COA) documenting identity, assay, and impurity profiles are provided with every shipment. We support compliance with relevant industry standards and can supply grades suitable for various regulatory frameworks upon request.

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 away from direct light exposure.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 98.0 %
Melting Point	150 - 155 °C
Loss on Drying	≤ 0.5 %
Ash Content	≤ 0.1 %
Heavy Metals (as Pb)	≤ 10 ppm

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