Description

Tetrakis[o-(Phenyltridecylphosphito)Methyl]Methane is a high-performance organophosphite antioxidant and stabilizer. This compound is valued for its ability to effectively inhibit oxidative degradation and prevent color formation in sensitive polymer systems during high-temperature processing. It is a critical additive for manufacturers requiring long-term thermal stability and color retention in their finished products, particularly in the plastics and synthetic fiber industries.

Application

• Primary antioxidant and process stabilizer for polyolefins (PP, HDPE, LDPE) during extrusion and molding.
• Color stabilizer in engineering plastics such as polycarbonate (PC) and acrylonitrile butadiene styrene (ABS).
• Synergistic component in stabilization packages for synthetic fibers and filaments to prevent thermal yellowing.
• Stabilizer for adhesives, sealants, and elastomers to enhance shelf-life and processing stability.
• Additive in lubricant and grease formulations to prevent oxidation and viscosity increase.
• Stabilizing agent for other organic substrates susceptible to thermal and oxidative degradation.

Basic Information

Product Name	Tetrakis[o-(Phenyltridecylphosphito)Methyl]Methane
CAS No.	37984-67-1
Molecular Formula	C81H132O12P4
Molecular Weight	1410.78 g/mol
Synonyms	Tetrakis(2,4-di-tert-butylphenyl) 4,4'-biphenylylene diphosphonite; P-EPQ; Phosphonite P-EPQ; Irgafos P-EPQ; Tetrakis(2,4-di-tert-butylphenyl)-4,4'-biphenylylene diphosphonite; 4,4'-Biphenylylene bis(di-tert-butylphenyl phosphonite); Antioxidant P-EPQ; CAS 119345-01-6 (related isomer/commercial blend identifier)
EINECS	Contact for details

Quality Control

Our production of Tetrakis[o-(Phenyltridecylphosphito)Methyl]Methane adheres to stringent quality management protocols. Every batch is analyzed to ensure it meets precise specifications for identity, purity, and performance. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profile, and physical properties is provided with each shipment to guarantee consistency and support your quality assurance processes.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated place at room temperature (15-25°C). This material is easily oxidized; for long-term storage, maintaining an inert atmosphere (e.g., under nitrogen) in the headspace of the container is recommended to preserve efficacy.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.0 %
Melting Point	75 - 85 °C
Loss on Drying	≤ 0.5 %
Phosphorus Content	8.5 - 9.0 %

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