Description

2-Ethylhexyl 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 oxidative degradation and prevent discoloration in sensitive polymer systems. This makes it a critical additive for manufacturers in the plastics, synthetic fiber, and rubber industries seeking to enhance the durability and longevity of their products under demanding conditions.

Application

• Polymer Stabilizer: Acts as a highly effective secondary antioxidant and color stabilizer in polyolefins (PP, PE), PVC, polycarbonates, and engineering plastics.
• Synthetic Fiber Production: Used to prevent thermal and oxidative degradation during the high-temperature melt processing of fibers like polyester and nylon.
• Rubber Industry: Employed as an antioxidant in synthetic rubber formulations to protect against heat aging and maintain elasticity.
• Lubricant & Grease Additive: Functions as an anti-wear and antioxidant agent in advanced synthetic lubricants and industrial greases.
• Adhesive & Sealant Formulations: Enhances the thermal stability and shelf-life of hot-melt and reactive adhesive systems.
• Intermediate for Further Synthesis: Serves as a key building block in the production of other specialized phosphite and phosphate esters.

Basic Information

Product Name	2-Ethylhexyl Diphenyl Phosphite
CAS No.	15647-08-2
Molecular Formula	C20H27O3P
Molecular Weight	346.40 g/mol
Synonyms	Phosphorous Acid, 2-Ethylhexyl Diphenyl Ester; Diphenyl 2-Ethylhexyl Phosphite; 2-Ethylhexyl Diphenyl Phosphite; Dioctyl Diphenyl Phosphite (common name); EHDPP; Antioxidant EHDPP; Weston EHDPP; Phosphite Stabilizer EHDPP; Octyl Diphenyl Phosphite
EINECS	239-707-2

Quality Control

Our 2-Ethylhexyl Diphenyl Phosphite is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing, including assay, color, acidity, and refractive index measurements, to ensure it meets stringent industry specifications. Certificates of Analysis (COA) documenting purity and key parameters are provided with each shipment to guarantee traceability and consistency for your production processes.

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) in the headspace of partially used containers is recommended to preserve efficacy. Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	Clear, colorless to pale yellow liquid
Identification (IR)	Conforms
Assay (HPLC)	≥ 98.0 %
Color (APHA)	≤ 50
Acidity (as H3PO4)	≤ 0.05 %
Refractive Index (n20/D)	1.525 - 1.535
Density (20°C)	1.040 - 1.060 g/mL
Moisture (KF)	≤ 0.1 %

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