Description

Antioxidant 565 is a high-performance, hindered phenolic antioxidant widely recognized for its excellent stabilizing properties. It is essential for preventing oxidative degradation and extending the service life of polymers and other sensitive materials. This additive is a critical component for manufacturers in the plastics, rubber, and synthetic fiber industries seeking to enhance product durability and performance under demanding conditions.

Application

• Polymer Stabilization: Primary antioxidant for polyolefins (PP, PE), polyamides, and engineering plastics to prevent thermal-oxidative degradation during processing and end-use.
• Rubber Industry: Protects synthetic rubbers like SBR, NBR, and EPDM from aging, maintaining elasticity and mechanical properties.
• Adhesives & Sealants: Enhances the shelf-life and long-term stability of hot-melt and pressure-sensitive adhesive formulations.
• Synthetic Fibers: Incorporated into fiber spinning processes to protect against heat-induced yellowing and strength loss.
• Lubricants & Greases: Used as an antioxidant additive in industrial lubricants and greases to inhibit sludge formation and viscosity increase.
• Fuel & Oil Additives: Acts as a stabilizer in fuels and transformer oils to prevent gum formation and oxidative breakdown.

Basic Information

Product Name	Antioxidant 565
CAS No.	991-84-4
Molecular Formula	C40H58O6S2
Molecular Weight	699.0 g/mol
Synonyms	2,2'-Thiodiethylene bis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]; Irganox 565; Antioxidant 565; 3,5-Bis(1,1-dimethylethyl)-4-hydroxybenzenepropanoic acid thiodi-2,1-ethanediyl ester; 2,2'-Thiobis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid] ethylene ester; 4,4'-Thiobis(2-tert-butyl-5-methylphenol) ethylene ester (common misnomer); AO-565; Phenolic thioester antioxidant
EINECS	213-590-1

Quality Control

Our Antioxidant 565 is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity, melting point, and antioxidant efficacy. A comprehensive Certificate of Analysis (COA) detailing assay results and impurity profiles is provided with each shipment to guarantee consistency and traceability for our global B2B clients.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled 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
Melting Point	91 - 96 °C
Assay (HPLC)	≥ 98.0 %
Volatile Matter	≤ 0.5 %
Ash Content	≤ 0.1 %

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