Description

2,4-Dinonylphenyl Bis(4-Nonylphenyl) Phosphite is a high-performance, sterically hindered organophosphite antioxidant. This compound matters for its exceptional efficacy in stabilizing polymers against thermal and oxidative degradation during processing and long-term use. It is primarily needed by manufacturers in the plastics, synthetic rubber, and specialty lubricant industries seeking to enhance product durability and lifespan.

Application

• Primary antioxidant and process stabilizer for polyolefins (PP, HDPE, LDPE) to prevent chain scission and cross-linking.
• Critical additive in synthetic lubricants and hydraulic fluids to inhibit oxidation and sludge formation under high-temperature operation.
• Stabilizer component for engineering plastics such as ABS, polycarbonate blends, and nylons to maintain color and mechanical properties.
• Used in the production of adhesives, sealants, and elastomers to improve their resistance to heat aging.
• Synergistic co-stabilizer in PVC formulations, often used with other stabilizers to enhance overall performance.
• Protective agent in thermoplastic polyurethanes (TPU) and other sensitive polymers prone to yellowing.

Basic Information

Product Name	2,4-Dinonylphenyl Bis(4-Nonylphenyl) Phosphite
CAS No.	85030-49-5
Molecular Formula	C60H99O3P
Molecular Weight	899.4 g/mol
Synonyms	Bis(4-nonylphenyl) 2,4-dinonylphenyl phosphite; Tris(nonylphenyl) phosphite (mixed isomer); TNPP; Phosphorous acid, tris(nonylphenyl) ester; Antioxidant TNPP; Polygard; Nonylphenyl phosphite (tri-); Tris(monononylphenyl) phosphite; Doverphos S-686
EINECS	285-248-7

Quality Control

Every batch of our 2,4-Dinonylphenyl Bis(4-Nonylphenyl) Phosphite is produced and tested under a strict quality management system. We ensure compliance with relevant industry standards for polymer additives. A comprehensive Certificate of Analysis (COA) detailing purity, assay, and key physical properties is provided with each shipment to guarantee batch-to-batch consistency and performance.

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 hygroscopic (moisture-sensitive) and easily oxidized; it is recommended to store under an inert atmosphere (e.g., nitrogen) after opening to maintain maximum efficacy. Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	Clear, viscous liquid
Color (Gardner)	≤ 3
Assay (HPLC)	≥ 95.0%
Acidity (as H3PO4)	≤ 0.1%
Moisture (Karl Fischer)	≤ 0.1%
Phosphorus Content	3.4 - 3.6%
Density (25°C)	0.97 - 0.99 g/cm³
Refractive Index (nD20)	1.525 - 1.535

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