Description

Dinonyl Phenyl Phosphite is a high-performance organophosphorus compound widely used as a stabilizer and antioxidant in polymer processing. Its primary value lies in its ability to effectively inhibit thermal and oxidative degradation, thereby extending the service life and maintaining the color and mechanical properties of various polymeric materials. This makes it an essential additive for manufacturers in the plastics, synthetic rubber, and lubricant industries seeking to enhance product durability and performance under demanding conditions.

Application

Dinonyl Phenyl Phosphite serves as a critical performance additive across several industrial sectors:

• Polymer Stabilization: Acts as a highly effective secondary antioxidant and phosphite processing stabilizer for polyolefins (PP, PE), PVC, ABS, and engineering plastics to prevent yellowing and maintain molecular weight during high-temperature processing.
• Synthetic Rubber Production: Used as a stabilizer in the manufacture of SBR, polybutadiene, and other synthetic elastomers to protect against heat-induced degradation.
• Lubricant & Grease Formulation: Functions as an antioxidant and anti-wear additive in synthetic lubricants, hydraulic fluids, and industrial greases, improving their thermal-oxidative stability.
• Adhesive & Sealant Systems: Incorporated to prevent gelation and viscosity increase in hot-melt adhesives and polyurethane-based systems during storage and application.
• Color Protection: Particularly effective in stabilizing pigmented polymer compounds against color shift caused by heat and shear during extrusion or injection molding.

Basic Information

Product Name	Dinonyl Phenyl Phosphite
CAS No.	20267-15-6
Molecular Formula	C30H55O3P
Molecular Weight	494.73 g/mol
Synonyms	Phosphorous Acid, Dinonyl Phenyl Ester; Bis(nonylphenyl) Phosphite; Dinonylphenyl Phosphite; DNPP; Nonylphenol Phosphite; Antioxidant DNPP; Tris(nonylphenyl) Phosphite (related mixture); Stabilizer DNPP
EINECS	243-680-6

Quality Control

Our Dinonyl Phenyl Phosphite is manufactured under a stringent quality management system. Every batch undergoes comprehensive analytical testing to ensure it meets precise specifications for purity, color, acidity, and phosphite content, guaranteeing consistent performance as a polymer stabilizer. A Certificate of Analysis (COA) documenting these results is provided with each shipment to support your quality assurance protocols.

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); containers must be kept tightly sealed to prevent contact with atmospheric moisture, which can lead to hydrolysis and reduced efficacy.

Specification

Item	Specification
Appearance	Clear, pale yellow to amber liquid
Identification (IR)	Conforms to structure
Assay (Phosphite Content)	≥ 95.0 %
Acid Value	≤ 1.0 mg KOH/g
Color (Gardner)	≤ 3
Refractive Index (n20D)	1.520 - 1.530
Density (20°C)	0.970 - 0.990 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.