Description

Phosphorous Acid, Diphenyl Ester is a specialized organophosphorus compound widely utilized as a high-performance intermediate and additive. Its value lies in its ability to act as a versatile building block for synthesizing more complex phosphorus-containing molecules, including flame retardants and stabilizers. This product is essential for manufacturers in the polymer, agrochemical, and specialty chemical industries seeking to enhance material properties or develop new functional compounds.

Application

• Flame Retardant Intermediate: A key precursor in the synthesis of advanced halogen-free and phosphorus-based flame retardants for engineering plastics, textiles, and coatings.
• Polymer Stabilizer: Used to produce phosphite and phosphonite antioxidants that protect polymers like polyolefins and PVC from thermal and oxidative degradation during processing and service life.
• Agrochemical Synthesis: Serves as a critical intermediate in the manufacture of certain organophosphorus pesticides and plant growth regulators.
• Lubricant & Fuel Additive: Employed in formulating extreme pressure (EP) additives for lubricants and anti-wear agents for industrial fluids.
• Pharmaceutical Intermediate: Used in the research and development of bioactive molecules and active pharmaceutical ingredients (APIs) containing phosphorus.
• Crosslinking Agent: Functions as a crosslinker or curing agent in specific epoxy and other thermosetting resin systems.

Basic Information

Product Name	Phosphorous Acid, Diphenyl Ester
CAS No.	102-10-3
Molecular Formula	C12H11O3P
Molecular Weight	234.19 g/mol
Synonyms	Diphenyl Phosphite; Phenyl Phosphite; Diphenyl Hydrogen Phosphite; Phosphorous Acid Diphenyl Ester; Hydrogen Diphenyl Phosphite; DPHP; NSC 66419; P,P-Diphenyl Phosphonite
EINECS	203-007-9

Quality Control

Our Phosphorous Acid, Diphenyl Ester is manufactured under a stringent quality management system. Each batch undergoes comprehensive analytical testing, including assay, purity, and impurity profile analysis, to ensure it meets exacting standards for industrial and fine chemical applications. Certificates of Analysis (COA) documenting all critical parameters are provided with every shipment to guarantee traceability and consistency.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area away from incompatible materials such as strong acids, bases, and oxidizing agents. Recommended storage temperature is between 15°C and 25°C. Keep container tightly sealed when not in use to minimize moisture absorption.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Identification (IR)	Conforms
Assay (GC or Titration)	≥ 98.0%
Acidity (as H3PO3)	≤ 0.5%
Water Content (KF)	≤ 0.1%
Refractive Index (n20D)	1.555 - 1.560
Density (20°C)	1.220 - 1.230 g/mL

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