Description

Diphenyl Phosphite is a versatile organophosphorus compound widely utilized as a key intermediate and performance additive in advanced chemical synthesis. Its primary value lies in its ability to act as a phosphitylating agent and a stabilizer, enhancing the properties and longevity of various industrial products. This chemical is essential for manufacturers and R&D teams in the polymer, agrochemical, and specialty chemical sectors seeking to improve product performance and process efficiency.

Application

• Polymer Stabilizer: Acts as a secondary antioxidant and thermal stabilizer in the production of polyolefins, PVC, and other polymers to prevent degradation during processing and extend service life.
• Chemical Intermediate: Serves as a crucial building block in the synthesis of organophosphorus ligands, flame retardants, and agrochemical active ingredients.
• Lubricant & Fuel Additive: Used as an anti-wear agent and antioxidant in advanced lubricant formulations and fuel systems to reduce friction and prevent oxidation.
• Epoxy Resin Modifier: Employed to modify the properties of epoxy resins, enhancing flexibility, adhesion, and thermal stability in coatings and composites.
• Phosphitylation Agent: A key reagent in oligonucleotide synthesis and other fine chemical processes for introducing phosphite protecting groups.
• Plasticizer Co-stabilizer: Works synergistically with primary stabilizers in plasticized PVC applications to improve color retention and long-term stability.

Basic Information

Product Name	Diphenyl Phosphite
CAS No.	4712-55-4
Molecular Formula	C12H11O3P
Molecular Weight	234.19 g/mol
Synonyms	Diphenyl phosphonate; Phenyl phosphite; Phosphorous acid, diphenyl ester; Diphenoxyphosphine oxide; DPP; Diphenyl hydrogen phosphite; Phenol, phosphite (2:1); NSC 66411
EINECS	225-202-8

Quality Control

Our Diphenyl Phosphite is manufactured under a stringent quality management system to ensure batch-to-batch consistency and reliability. Each lot undergoes comprehensive analytical testing, including assay, purity verification, and impurity profiling, to meet exacting customer and industry specifications. Certificates of Analysis (COA) documenting all critical quality attributes are provided with every shipment to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed to prevent contact with atmospheric moisture. Keep away from strong acids and incompatible materials such as strong oxidizing agents.

Specification

Item	Specification
Appearance	Colorless to pale yellow clear liquid
Identification (IR)	Conforms
Assay (GC)	≥ 98.0 %
Phenol Content	≤ 1.0 %
Acidity (as H3PO4)	≤ 0.5 %
Water Content (KF)	≤ 0.1 %
Refractive Index (n20/D)	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.