Description

Phosphoric Acid 1,3-Phenylene Tetrakis(2,6-Dimethylphenyl) Ester (CAS NO 139189-30-3) is a high-performance, sterically hindered organophosphite antioxidant. This compound matters for its exceptional ability to prevent thermal and oxidative degradation in sensitive polymers and synthetic materials, thereby extending their service life and maintaining critical properties. It is primarily needed by manufacturers in the polymer, plastics, and specialty chemical industries seeking to enhance the stability and performance of their high-value products.

Application

• Primary antioxidant and stabilizer in high-temperature polymer processing (e.g., polyolefins, polyamides, polyesters).
• Critical additive for hindered phenolic antioxidant synergist systems, enhancing overall stabilization efficiency.
• Protection of engineering plastics and synthetic fibers against thermal-oxidative degradation during extrusion and molding.
• Stabilizer component in adhesives, sealants, and elastomers to prevent premature aging and maintain elasticity.
• Used in the formulation of lubricants and hydraulic fluids to inhibit oxidation and sludge formation.
• Potential application as a process stabilizer in the production of specialty chemicals and intermediates.

Basic Information

Product Name	Phosphoric Acid 1,3-Phenylene Tetrakis(2,6-Dimethylphenyl) Ester
CAS No.	139189-30-3
Molecular Formula	C54H60O4P2
Molecular Weight	834.99 g/mol
Synonyms	1,3-Phenylene Tetrakis(2,6-dimethylphenyl) Diphosphite; Pentaerythritol Tetrakis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate) (common confusion, but a different antioxidant); Tris(2,4-di-tert-butylphenyl) Phosphite (related compound); Irgafos P-EPQ (potential trade name analogue); Organophosphite Antioxidant 139189-30-3; Phosphorous Acid, P,P'-(1,3-Phenylenebis(P,P',P''-tris(2,6-dimethylphenyl) Ester)); Tetrakis(2,6-dimethylphenyl) 1,3-Phenylenediphosphonite
EINECS	Contact for details

Quality Control

Our production of Phosphoric Acid 1,3-Phenylene Tetrakis(2,6-Dimethylphenyl) Ester adheres to stringent quality management protocols. Every batch undergoes rigorous analytical testing, including HPLC and NMR, to ensure high purity and consistent performance as a polymer stabilizer. Certificates of Analysis (COA) detailing assay, identity, and impurity profiles are provided to guarantee compliance with your technical specifications and support your quality assurance processes.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep the container tightly sealed to minimize exposure to moisture and atmospheric oxygen. Store away from strong bases and incompatible materials.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Melting Point	220 - 230 °C
Loss on Drying	≤ 0.5%
Heavy Metals (as Pb)	≤ 10 ppm
Phosphorus Content	Contact for details
Solution Color (APHA)	≤ 50

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