Description

4,4'-Thiobis-Phenol is a high-purity organic compound featuring a central thioether linkage connecting two phenolic rings. This unique structure makes it a valuable intermediate and antioxidant, offering excellent thermal stability and radical scavenging properties. It is essential for manufacturers in the polymer, agrochemical, and specialty chemical industries seeking to enhance material performance and longevity.

Application

• Polymer Additive & Antioxidant: A key intermediate in the synthesis of high-performance antioxidants and stabilizers for plastics, rubbers, and synthetic fibers to prevent thermal and oxidative degradation.
• Epoxy Resin Curing Agent/Modifier: Used as a curing agent or modifier for epoxy resin systems, contributing to improved thermal resistance and mechanical properties in advanced composites and coatings.
• Pharmaceutical Intermediate: Serves as a crucial building block in the synthesis of certain active pharmaceutical ingredients (APIs) and diagnostic agents.
• Agrochemical Synthesis: An important precursor in the manufacturing of specific herbicides, fungicides, and other crop protection agents.
• Liquid Crystal & Electronic Materials: Used in the production of monomers for liquid crystal polymers (LCPs) and other advanced electronic materials requiring high thermal stability.
• Dye & Pigment Intermediate: Acts as an intermediate in the synthesis of sulfur-containing dyes and organic pigments.

Basic Information

Product Name	4,4'-Thiobis-Phenol
CAS No.	2664-63-3
Molecular Formula	C12H10O2S
Molecular Weight	218.27 g/mol
Synonyms	4,4'-Thiodiphenol; Bis(4-hydroxyphenyl) Sulfide; 4-Hydroxyphenyl Sulfide; p,p'-Thiodiphenol; Thiobis(4-hydroxybenzene); 4,4'-Sulfonyldiphenol (common misnomer, verify context); Antioxidant 736; AO 736
EINECS	220-200-9

Quality Control

Our 4,4'-Thiobis-Phenol is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise customer specifications and industry standards. A comprehensive Certificate of Analysis (COA) detailing all test results is provided with each shipment.

Storage

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

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.5%
Melting Point	150 - 154 °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.