Description

Diisooctyl Phenyl Phosphite is a versatile organophosphite compound widely recognized as a high-performance secondary antioxidant and stabilizer. Its primary value lies in its ability to effectively decompose hydroperoxides, thereby preventing polymer degradation and extending material lifespan. This makes it an essential additive for manufacturers in the plastics, rubber, and synthetic fiber industries seeking to enhance product durability and color stability.

Application

• Polymer Stabilization: Acts as a secondary antioxidant (hydroperoxide decomposer) in polyolefins (PP, PE), PVC, ABS, and engineering plastics to prevent thermal and oxidative degradation during processing and end-use.
• Color Retention Agent: Used in polymer formulations to prevent yellowing and maintain color clarity, particularly in sensitive applications.
• Synergistic Stabilizer Systems: Employed in combination with primary antioxidants (e.g., hindered phenols) to create highly effective stabilization packages for long-term polymer performance.
• Rubber Industry: Functions as an antioxidant and stabilizer in synthetic rubber production and processing.
• Adhesives and Sealants: Enhances the thermal stability and shelf-life of adhesive formulations.
• Lubricant and Fuel Additive: Serves as an antioxidant additive in industrial lubricants and fuels to inhibit oxidation and sludge formation.

Basic Information

Product Name	Diisooctyl Phenyl Phosphite
CAS No.	26544-22-9
Molecular Formula	C22H39O3P
Molecular Weight	382.51 g/mol
Synonyms	Phenol, isooctyl phosphite (3:1); Phosphorous acid, isooctyl phenyl ester; Phenyl diisooctyl phosphite; DIOP; Antioxidant DIOP; Isooctyl phenyl phosphite; Stabilizer DIOP; Tris(isooctylphenyl) phosphite
EINECS	247-816-7

Quality Control

Our Diisooctyl Phenyl Phosphite is manufactured under a stringent quality management system. Each batch undergoes comprehensive analytical testing to ensure it meets precise specifications for purity, color, acidity, and other critical parameters. A Certificate of Analysis (COA) documenting these results is provided with every 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 product is hygroscopic (moisture-sensitive); keep the container tightly sealed when not in use to minimize exposure to atmospheric moisture.

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)	1.4780 - 1.4820
Density (20°C)	0.940 - 0.960 g/mL
Moisture (KF)	≤ 0.1 %

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