Description

Isonox(R) 232 is a high-performance, hindered phenolic antioxidant widely used to inhibit oxidative degradation in various polymer systems. Its primary value lies in providing exceptional long-term thermal stability, preventing chain scission and discoloration in materials exposed to heat and oxygen during processing and service life. This makes it a critical additive for manufacturers in the plastics, rubber, and synthetic fiber industries seeking to enhance product durability and lifespan. The compound is identified by CAS NO 4306-88-1.

Application

Isonox 232 is a versatile antioxidant employed across multiple sectors to protect materials from oxidative damage. Key application areas include:

• Polyolefin Stabilization: Primary antioxidant for polyethylene (PE) and polypropylene (PP) in films, fibers, and molded articles.
• Engineering Plastics: Thermal stabilizer for polymers like polystyrene (PS), ABS, and polycarbonate (PC) blends.
• Rubber and Elastomers: Protects synthetic rubbers (SBR, BR, EPDM) from heat aging in automotive and industrial goods.
• Adhesives and Sealants: Prevents gelation and maintains viscosity stability in hot-melt and reactive adhesive formulations.
• Synthetic Fibers: Incorporated into polyamide and polyester fibers to retain strength and color during high-temperature processing.
• Hot-Melt Coatings: Essential for preventing oxidation and degradation in coatings applied at elevated temperatures.

Basic Information

Product Name	Isonox(R) 232
CAS No.	4306-88-1
Molecular Formula	C29H44O3
Molecular Weight	440.66 g/mol
Synonyms	2,6-Di-tert-butyl-4-(4,6-bis(octylthio)-1,3,5-triazin-2-ylamino)phenol; Phenol, 2,6-bis(1,1-dimethylethyl)-4-[[4,6-bis(octylthio)-1,3,5-triazin-2-yl]amino]-; Antioxidant 232; AO 232; Octylated reaction product of 2,6-di-tert-butylphenol and formaldehyde and 2,4,6-trichloro-1,3,5-triazine and octyl mercaptan; Irganox 1520 (related/comparable antioxidant class).
EINECS	224-327-6

Quality Control

Our Isonox 232 is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing to ensure it meets precise specifications for identity, purity, and performance. Certificates of Analysis (COA) documenting key parameters such as assay, melting point, and color are available upon request to support your quality assurance protocols.

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. Under these conditions, the product has an extended shelf life.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 98.0 %
Melting Point	90 - 95 °C
Loss on Drying	≤ 0.5 %
Ash Content	≤ 0.1 %
Color (APHA)	≤ 100

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