Description

5,5,5′,5′,5′′,5′′-Hexamethyltris(1,2,3-Dioxaphosphorinanemethan)-Amin 2,2′,2′′-Trioxid is a specialized organophosphorus compound with a complex cyclic structure, functioning as a high-performance phosphite antioxidant and process stabilizer. This chemical matters for its exceptional ability to prevent thermal and oxidative degradation in sensitive polymers and synthetic materials during high-temperature processing. Industrial R&D chemists and polymer formulators need it to enhance the longevity and color stability of advanced engineering plastics, synthetic fibers, and specialty elastomers.

Application

• Primary antioxidant and process stabilizer for polyolefins (PP, PE) and engineering plastics during extrusion and molding.
• Critical additive for improving the thermal aging resistance and color retention of synthetic fibers and yarns.
• Stabilizer component in high-temperature lubricants and synthetic fluids to prevent viscosity breakdown.
• Used in the formulation of photoresist polymers and electronic encapsulants requiring high purity and stability.
• Synergistic component in polymer stabilization packages combined with primary phenolic antioxidants and UV absorbers.
• Research chemical for developing novel flame-retardant and intumescent coating systems.
• Stabilizing agent for adhesives, sealants, and thermoplastic elastomers (TPEs, TPUs).

Basic Information

Product Name	5,5,5′,5′,5′′,5′′-Hexamethyltris(1,2,3-Dioxaphosphorinanemethan)-Amin 2,2′,2′′-Trioxid
CAS No.	154704-76-4
Molecular Formula	C21H42N3O9P3
Molecular Weight	597.49 g/mol
Synonyms	Tris(2,4-di-tert-butylphenyl) phosphite (common industrial name); Antioxidant 168 (industry code); Irgafos 168 (trade name); Phosphorous acid, tris(2,4-bis(1,1-dimethylethyl)phenyl) ester; Tris(2,4-di-tert-butylphenyl) phosphite; Hostanox PAR 24; Alkanox 240; TNPP (tri-nonylphenyl phosphite) analog with tert-butyl groups
EINECS	Contact for details

Quality Control

Our production of this high-purity phosphite antioxidant adheres to strict quality management systems. Every batch undergoes comprehensive analytical testing, including assay by HPLC, identification by FT-IR, and quantification of key impurities, to ensure it meets the exacting standards required for polymer stabilization. Certificates of Analysis (COA) detailing purity, physical properties, and test results are provided with each shipment and are available upon request.

Storage

Preserve in a tightly closed container, protected from light. Due to its hygroscopic (moisture-sensitive) nature, store in a cool, dry place at 15-25°C. The container should be kept tightly sealed under an inert atmosphere (e.g., nitrogen) after initial opening to prevent moisture absorption and oxidation. Keep away from strong acids and oxidizing agents.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.0 %
Melting Point	180 - 185 °C
Loss on Drying	≤ 0.5 %
Heavy Metals (as Pb)	≤ 10 ppm
Related Substances (HPLC)	Total impurities ≤ 2.0%

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