Description

Tris(Dinonylphenyl) Phosphite is a high-performance organophosphite antioxidant and stabilizer widely used in polymer processing. Its primary value lies in its ability to prevent thermal and oxidative degradation, thereby extending the service life and maintaining the color and physical properties of sensitive materials. This product is essential for manufacturers in the plastics, rubber, and synthetic fiber industries who require reliable protection for their polymers during high-temperature processing and long-term use.

Application

• Primary antioxidant and processing stabilizer for polyolefins (PP, PE) to prevent yellowing and chain scission.
• Effective color and melt flow stabilizer in engineering plastics such as ABS, polycarbonate blends, and nylon.
• Synergistic co-stabilizer in PVC formulations, enhancing the performance of primary metal-based heat stabilizers.
• Protective additive for synthetic rubbers and elastomers against heat aging.
• Stabilizer component in adhesives, sealants, and polymer-based coatings.
• Used in the production of polyurethane foams and other specialty polymers.

Basic Information

Product Name	Tris(Dinonylphenyl) Phosphite
CAS No.	1333-21-7
Molecular Formula	C63H93O3P
Molecular Weight	929.4 g/mol
Synonyms	Tris(nonylphenyl) phosphite; Phosphorous acid, tris(nonylphenyl) ester; TNPP; Tris(monononylphenyl) phosphite; Antioxidant TNPP; Polygard; Nonylphenol phosphite (3:1); Dinonylphenyl phosphite
EINECS	215-588-8

Quality Control

Our Tris(Dinonylphenyl) Phosphite is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing to ensure consistent purity, performance, and compliance with relevant industry specifications. A detailed Certificate of Analysis (COA) documenting assay, color, acidity, and other critical parameters is provided with each shipment to guarantee traceability and quality assurance for our global B2B clients.

Storage

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

Specification

Item	Specification
Appearance	Clear, pale yellow viscous liquid
Identification (IR)	Conforms
Assay (HPLC)	≥ 95.0 %
Acidity (as H3PO4)	≤ 0.1 %
Color (Gardner)	≤ 3
Refractive Index (nD20)	1.525 - 1.535
Density (20°C)	0.98 - 1.00 g/mL

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