Description

Isooctyl Diphenyl Phosphite is a versatile organophosphorus compound widely used as a high-performance stabilizer and antioxidant. Its primary value lies in its ability to effectively inhibit thermal and oxidative degradation, thereby extending the service life of polymeric materials. This product is essential for manufacturers in the plastics, rubber, and lubricant industries seeking to enhance the durability and color stability of their formulations.

Application

• As a secondary antioxidant and stabilizer in polyolefins (PP, PE), PVC, and engineering plastics to prevent polymer degradation during processing and end-use.
• As a color stabilizer in synthetic fibers and thermoplastic resins, preventing yellowing and maintaining aesthetic quality.
• As an additive in synthetic lubricants and hydraulic fluids to improve oxidative stability and reduce sludge formation.
• As a chelating agent and process stabilizer in the production of polycarbonates and other condensation polymers.
• As a synergist in combination with primary phenolic antioxidants (e.g., BHT, Irganox) to provide enhanced stabilization in demanding applications.
• As a stabilizer for adhesives and sealants, protecting against heat and oxygen-induced breakdown.

Basic Information

Product Name	Isooctyl Diphenyl Phosphite
CAS No.	26401-27-4
Molecular Formula	C20H27O3P
Molecular Weight	346.40 g/mol
Synonyms	Phosphorous Acid, Isooctyl Diphenyl Ester; Diphenyl Isooctyl Phosphite; Isooctyloxy(diphenoxy)phosphine; Stabilizer ODPP; Antioxidant ODPP; Doverphos® 7; Weston® ODPP
EINECS	247-683-3

Quality Control

Our Isooctyl Diphenyl Phosphite is manufactured under a stringent quality management system. Every batch undergoes comprehensive analytical testing, including assay, color, and acidity determination, to ensure it meets precise specifications and is free from detrimental impurities. A Certificate of Analysis (COA) documenting these results is provided with each shipment to guarantee traceability and compliance with your quality requirements.

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, colorless to pale yellow liquid
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0 %
Acidity (as H3PO4)	≤ 0.1 %
Color (APHA)	≤ 50
Refractive Index (n20/D)	1.525 - 1.535
Density (20°C)	1.04 - 1.07 g/cm³

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