Description

Phosphorous Acid Tris[2-(α-Methylbenzyl)Phenyl] Ester is a specialized organophosphorus compound with the CAS number 28461-99-6. This chemical serves as a high-performance intermediate and additive, valued for its unique sterically hindered phenolic structure. It is primarily sought by manufacturers in the polymer and specialty chemical industries for applications requiring advanced stabilization and functional modification. Its molecular design offers specific reactivity and compatibility advantages in demanding formulations.

Application

• Polymer Stabilizer: Acts as a processing and long-term heat stabilizer (LTHS) in plastics like polyolefins (PP, PE) and engineering polymers, mitigating degradation during high-temperature extrusion and molding.
• Antioxidant Synergist: Used in combination with primary antioxidants (e.g., hindered phenols, phosphites) to enhance the oxidative stability of lubricants, fuels, and elastomers.
• Flame Retardant Component: Serves as a phosphorus-containing precursor or synergist in flame-retardant formulations for textiles, coatings, and electronic materials.
• Chemical Intermediate: Utilized in the synthesis of more complex phosphite and phosphate esters, ligands for catalysts, and other specialty organic compounds.
• Adhesive & Sealant Additive: Improves the thermal aging resistance and durability of hot-melt adhesives, polyurethane sealants, and other polymer-based bonding systems.
• Lubricant & Grease Additive: Functions as an anti-wear and antioxidant additive in synthetic lubricants and industrial greases.

Basic Information

Product Name	Phosphorous Acid Tris[2-(α-Methylbenzyl)Phenyl] Ester
CAS No.	28461-99-6
Molecular Formula	C48H45O3P
Molecular Weight	700.84 g/mol
Synonyms	Tris(2-(α-methylbenzyl)phenyl) phosphite; Tris[2-(α-Methylbenzyl)phenyl] Phosphite; Phosphorous Acid Tris(2-(1-Phenylethyl)phenyl) Ester; Tris(2-(1-phenylethyl)phenyl) phosphite; Irgafos P-EPQ (analogous commercial grade); Sterically hindered phosphite antioxidant; P-EPQ type stabilizer; Tris(2-(α-methylbenzyl)phenyl) ester of phosphorous acid
EINECS	Contact for details

Quality Control

Our production of Phosphorous Acid Tris[2-(α-Methylbenzyl)Phenyl] Ester adheres to stringent quality management protocols. Every batch undergoes comprehensive analytical testing, including assay, identification, and impurity profiling, to ensure consistency and performance. Certificates of Analysis (COA) documenting purity, physical properties, and stability are available upon request. We support customer audits and can provide material to meet specific regulatory or internal quality standards.

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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept sealed under an inert atmosphere (e.g., nitrogen) after opening to prevent moisture absorption and oxidation. Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	White to off-white crystalline powder or flakes
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.0%
Melting Point	95 - 105 °C
Loss on Drying	≤ 0.5%
Acidity (as H3PO4)	≤ 0.1%
Heavy Metals (as Pb)	≤ 10 ppm

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