Description

Tris-(2,4-Di-tert-Butyl-5-Methyl-Phenyl)Phosphite is a high-performance organophosphite antioxidant widely used in polymer stabilization. This compound is critical for preventing thermal and oxidative degradation during the processing and long-term service life of various polymers. It is an essential additive for manufacturers in the plastics, synthetic fiber, and rubber industries seeking to enhance product durability and color stability.

Application

• Primary antioxidant and processing stabilizer for polyolefins (PP, HDPE, LDPE).
• Protects engineering plastics (e.g., ABS, polycarbonate blends) from thermal degradation during high-temperature extrusion and molding.
• Used in synthetic fibers and filaments to maintain molecular weight and tensile strength during spinning and drawing processes.
• Stabilizer component in adhesives, sealants, and elastomers to prevent premature aging.
• Synergistic co-stabilizer when used with phenolic antioxidants and hindered amine light stabilizers (HALS) in advanced stabilization systems.
• Helps in color retention for pigmented polymer compounds, minimizing yellowing.

Basic Information

Product Name	Tris-(2,4-Di-tert-Butyl-5-Methyl-Phenyl)Phosphite
CAS No.	68972-23-6
Molecular Formula	C45H69O3P
Molecular Weight	689.00 g/mol
Synonyms	Tris(2,4-di-tert-butylphenyl) phosphite (common name); Phosphorous acid, tris(2,4-bis(1,1-dimethylethyl)-5-methylphenyl) ester; Irgafos 168; Alkanox 240; Doverphos S-9228; Hostanox PAR 24; Antioxidant 168; Tris(2,4-di-tert-butyl-5-methylphenyl)phosphite
EINECS	273-066-3

Quality Control

Our production of Tris-(2,4-Di-tert-Butyl-5-Methyl-Phenyl)Phosphite adheres to stringent quality management systems. Every batch is analyzed to ensure it meets high-purity specifications critical for sensitive polymer applications. Certificates of Analysis (COA) documenting purity, identity, and key physical parameters 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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after initial opening to prevent degradation from atmospheric moisture.

Specification

Item	Specification
Appearance	White crystalline powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 99.0 %
Melting Point	183 - 187 °C
Volatile Matter	≤ 0.5 %
Acidity (as H3PO4)	≤ 0.1 %
Solution Color (APHA)	≤ 50

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