Description

Phenyl Diisooctyl Phosphite is a versatile organophosphite compound widely used as a high-performance secondary antioxidant and stabilizer in polymer systems. Its primary value lies in its ability to effectively decompose hydroperoxides, thereby preventing oxidative degradation and extending the service life of finished products. This chemical is essential for manufacturers in the plastics, synthetic rubber, and lubricant industries seeking to enhance the thermal stability and color retention of their materials.

Application

• Primary use as a secondary antioxidant (hydroperoxide decomposer) in polyolefins (PP, PE), PVC, and engineering plastics.
• Stabilizer component in synthetic lubricants and grease formulations to prevent oxidation and viscosity change.
• Additive for synthetic rubber and elastomers to improve heat aging resistance.
• Stabilizer in adhesive and sealant formulations to maintain performance over time.
• Used as a synergist with primary phenolic antioxidants for enhanced stabilization packages.
• Intermediate in the synthesis of other specialty organophosphorus compounds.

Basic Information

Product Name	Phenyl Diisooctyl Phosphite
CAS No.	49637-59-4
Molecular Formula	C22H39O3P
Molecular Weight	382.51 g/mol
Synonyms	Phosphorous Acid, Phenyl Diisooctyl Ester; Diisooctyl Phenyl Phosphite; Phenyl Bis(6-methylheptyl) Phosphite; Phenyl Di(iso-octyl) Phosphite; PDOP; Antioxidant PDOP; Doverphos® 7 (Trade Name); Weston® PDOP (Trade Name)
EINECS	256-420-1

Quality Control

Our Phenyl Diisooctyl Phosphite is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing, including assay, color, and acidity determination, to ensure it meets the high-purity requirements for industrial applications. A Certificate of Analysis (COA) detailing all relevant specifications is provided with each shipment to guarantee traceability and compliance.

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 hygroscopic (moisture-sensitive) and should be kept under a dry inert atmosphere (e.g., nitrogen) after opening to prevent hydrolysis and oxidation.

Specification

Item	Specification
Appearance	Clear, colorless to pale yellow liquid
Identification (IR)	Conforms
Assay (Titration)	≥ 98.0 %
Acidity (as H3PO4)	≤ 0.1 %
Color (APHA)	≤ 50
Refractive Index (n20D)	1.4750 - 1.4850
Density (20°C)	0.940 - 0.960 g/mL

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