Description

Dinonylphenyl Bis(Nonylphenyl) Phosphite is a high-performance organophosphite antioxidant and stabilizer. This compound is critical for protecting polymers and other sensitive materials from oxidative degradation and thermal breakdown during processing and long-term use. It is an essential additive for manufacturers in the plastics, rubber, and specialty chemical industries seeking to enhance product durability and lifespan.

Application

• Primary antioxidant and process stabilizer for polyolefins (PP, PE) and engineering plastics.
• Synergistic co-stabilizer in PVC formulations to improve heat stability and color retention.
• Stabilizer for synthetic rubbers and elastomers to prevent chain scission and cross-linking.
• Additive in adhesives, sealants, and coatings to inhibit gelation and maintain viscosity.
• Stabilizing component in lubricants and hydraulic fluids to prevent oxidation and sludge formation.
• Intermediate in the synthesis of other specialized phosphite-based antioxidants.

Basic Information

Product Name	Dinonylphenyl Bis(Nonylphenyl) Phosphite
CAS No.	54771-30-1
Molecular Formula	C60H93O3P
Molecular Weight	893.35 g/mol
Synonyms	Bis(nonylphenyl) dinonylphenyl phosphite; Tris(dinonylphenyl) phosphite (common commercial name); Phosphorous acid, tris(dinonylphenyl) ester; TNPP (Tris(nonylphenyl) phosphite - related common industry term); Antioxidant TNPP; Polygard; Nonylphenyl phosphite (mixture); Stabilizer 4
EINECS	259-361-1

Quality Control

Our Dinonylphenyl Bis(Nonylphenyl) Phosphite is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing, including assay by titration and impurity profile analysis, to ensure it meets precise specifications for use as a polymer stabilizer. A comprehensive Certificate of Analysis (COA) detailing purity, color, acidity, and other critical parameters is provided with every shipment.

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; containers should be kept tightly sealed under an inert atmosphere (e.g., nitrogen) after opening to maintain product integrity.

Specification

Item	Specification
Appearance	Clear, viscous liquid
Color (APHA)	≤ 100
Assay (Phosphite Content)	≥ 98.0 %
Acidity (as Phosphorous Acid)	≤ 0.1 %
Refractive Index (n20D)	1.525 - 1.535
Density (20°C)	0.97 - 0.99 g/mL
Moisture (Karl Fischer)	≤ 0.1 %

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