Description

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

Application

• Primary antioxidant and process stabilizer for polyolefins (PP, PE) and engineering plastics.
• Synergistic component in stabilization packages for PVC, ABS, and other polymers.
• Stabilizer for synthetic lubricants and hydraulic fluids to prevent oxidation and viscosity change.
• Protective additive in adhesive and sealant formulations to maintain performance.
• Used in the production of color-stable and high-clarity plastic products.
• Stabilizer for elastomers and synthetic rubbers against heat aging.

Basic Information

Product Name	Isodecyl Bis(Nonylphenyl) Phosphite
CAS No.	93843-06-2
Molecular Formula	C34H55O3P
Molecular Weight	542.77 g/mol
Synonyms	Phosphorous Acid, Isodecyl Bis(Nonylphenyl) Ester; Isodecyl Dinonylphenyl Phosphite; Dinonylphenyl Isodecyl Phosphite; Antioxidant 398; Weston 398; Doverphos 398; Doverphos S-398; Phosphite Stabilizer 398; Tris(isodecyl) Phosphite (related); Nonylphenol Phosphite Ester
EINECS	Contact for details

Quality Control

Our Isodecyl Bis(Nonylphenyl) Phosphite is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing to ensure consistent purity, performance, and compliance with industry specifications. A comprehensive Certificate of Analysis (COA) detailing assay, 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. Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	Clear, viscous liquid
Color (APHA)	≤ 50
Assay (by Titration)	≥ 98.0 %
Acidity (as Phosphoric Acid)	≤ 0.05 %
Refractive Index (n20D)	1.520 - 1.530
Density (20°C)	0.980 - 1.000 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.