Description

Aos (Antioxidant) CAS NO 72674-05-6 is a high-performance phenolic antioxidant widely used to inhibit oxidative degradation in various polymer systems. Its primary value lies in extending the service life and maintaining the physical properties of materials exposed to heat and oxygen during processing and end-use. This antioxidant is essential for manufacturers in the plastics, rubber, and synthetic fiber industries seeking to enhance product durability and performance.

Application

• Primary antioxidant for polyolefins (PP, HDPE, LDPE) to prevent thermal oxidation during extrusion and molding.
• Stabilizer in engineering plastics and styrenic polymers to maintain color and mechanical strength.
• Additive in synthetic rubbers and elastomers to protect against aging and cracking.
• Used in adhesives and sealants to improve shelf-life and performance stability.
• Stabilizing component in polyurethane foams and other thermoset resins.
• Protective agent for lubricants and greases to reduce oxidative thickening and sludge formation.

Basic Information

Product Name	Aos (Antioxidant)
CAS No.	72674-05-6
Molecular Formula	C29H44O3
Molecular Weight	440.66 g/mol
Synonyms	2,2'-Methylenebis(6-tert-butyl-4-methylphenol); Antioxidant 2246; 2,2'-Methylenebis(4-methyl-6-tert-butylphenol); Bis(3-tert-butyl-2-hydroxy-5-methylphenyl)methane; MBMBP; AO-2246; CAO-14; Lowinox 22M46
EINECS	276-776-8

Quality Control

Our production of Aos (Antioxidant) adheres to stringent quality management protocols. Every batch undergoes comprehensive analytical testing, including assay, melting point, and impurity profile analysis, to ensure it meets precise specifications. Certificates of Analysis (COA) documenting purity and key physical-chemical parameters are provided as standard to guarantee supply consistency and performance reliability for your formulations.

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 strong oxidizing agents and heat sources to maintain product integrity.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 98.0 %
Melting Point	124 - 128 °C
Loss on Drying	≤ 0.5 %
Ash Content	≤ 0.1 %

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