Description

Di-n-Decyl Phosphite is an organophosphorus compound widely utilized as a high-performance secondary antioxidant and processing stabilizer. Its primary value lies in its ability to effectively decompose hydroperoxides, thereby preventing polymer degradation and extending material lifespan during high-temperature processing and long-term use. This makes it a critical additive for manufacturers in the plastics, synthetic rubber, and lubricant industries seeking to enhance product durability and color stability.

Application

• Polymer Stabilization: Acts as a secondary antioxidant in polyolefins (PP, PE), polyesters, and engineering plastics to prevent thermal and oxidative degradation during extrusion and molding.
• Synergistic Formulations: Used in combination with primary phenolic antioxidants (e.g., BHT, Irganox) to create highly effective stabilization packages for enhanced performance.
• Lubricant & Grease Additive: Serves as an antioxidant and anti-wear agent in synthetic lubricants and industrial greases to improve oxidative stability and equipment protection.
• Adhesive & Sealant Production: Incorporated to prevent gelation and maintain viscosity stability in hot-melt adhesives and various sealants during manufacture and application.
• Elastomer Processing: Improves the heat aging resistance of synthetic rubbers like SBR, NBR, and EPDM during compounding and vulcanization.
• Color Protection: Helps minimize color formation (yellowing) in finished plastic articles, crucial for clear and light-colored applications.

Basic Information

Item	Detail
Product Name	Di-n-Decyl Phosphite
CAS No.	7000-66-0
Molecular Formula	C20H43O3P
Molecular Weight	362.53 g/mol
Synonyms	Didecyl Phosphite; Bis(n-decyl) Phosphite; Phosphorous Acid, Di-n-Decyl Ester; Di(decyl) Hydrogen Phosphite; Hostanox PAR 24; Doverphos® 253; Weston® DDP; Antioxidant 253
EINECS	230-274-7

Quality Control

Our Di-n-Decyl Phosphite is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing to ensure it meets precise specifications for purity, acidity, and color. A Certificate of Analysis (COA) detailing these results is provided and available upon request to support your quality assurance and regulatory compliance needs.

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 product is easily oxidized; for long-term storage, maintaining an inert atmosphere (e.g., under nitrogen) is recommended to preserve efficacy. Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	Clear, colorless to pale yellow liquid
Assay (by Titration)	≥ 95.0 %
Acidity (as H3PO4)	≤ 0.5 %
Color (APHA)	≤ 50
Refractive Index (n20D)	1.450 - 1.455
Density (20°C)	0.89 - 0.92 g/cm³

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