Description

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

Application

• Primary antioxidant and stabilizer in polyolefins (PP, PE) and other polymers.
• Protects synthetic lubricants and hydraulic fluids from oxidation and viscosity breakdown.
• Used as a process stabilizer during the high-temperature extrusion and molding of plastics.
• Improves the color stability and weatherability of finished plastic products.
• Acts as a synergistic co-stabilizer in combination with hindered phenol antioxidants.
• Employed in the formulation of adhesives and sealants to prevent gelation and maintain performance.
• Provides stabilization for elastomers and synthetic rubbers against heat aging.

Basic Information

Product Name	Didodecyl Nonylphenyl Phosphite
CAS No.	35239-35-1
Molecular Formula	C45H87O3P
Molecular Weight	707.15 g/mol
Synonyms	Bis(dodecyl) nonylphenyl phosphite; Phosphorous acid, bis(dodecyl) nonylphenyl ester; Nonylphenol didodecyl phosphite; Antioxidant 288; Weston 288; Doverphos 288; ADK STAB 288; Trisnonylphenyl phosphite (related); TNPP (related); Organophosphite stabilizer 288
EINECS	Contact for details

Quality Control

Our Didodecyl Nonylphenyl Phosphite is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity, color, and phosphite content. A Certificate of Analysis (COA) detailing assay, acidity, and other critical parameters is provided with each shipment to guarantee 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; containers should be kept tightly sealed under an inert atmosphere (e.g., nitrogen) after opening to maintain product integrity.

Specification

Item	Specification
Appearance	Clear, pale yellow liquid
Identification (IR)	Conforms
Assay (Phosphite Content)	≥ 95.0 %
Acidity (as Phosphorous Acid)	≤ 0.5 %
Color (APHA)	≤ 100
Refractive Index (n20D)	1.4780 - 1.4820
Density (20°C)	0.930 - 0.950 g/mL
Moisture (KF)	≤ 0.1 %

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