Description

4-Hydroxyphenyl Diphenyl Phosphate is a specialized organophosphate compound primarily valued as a reactive intermediate and flame retardant synergist. Its chemical structure, featuring both phenolic and phosphate ester groups, makes it a versatile building block for synthesizing more complex phosphate esters and polymeric materials. This product is essential for manufacturers in the polymer, electronics, and specialty chemical industries seeking to enhance material properties such as flame resistance and thermal stability.

Application

• Flame Retardant Synergist: Used in combination with other flame retardants to improve the fire resistance of engineering plastics, epoxy resins, and polycarbonates.
• Polymer Intermediate: Serves as a key monomer or additive in the synthesis of high-performance polymers and oligomeric phosphate esters.
• Electronic Materials: Incorporated into encapsulants, printed circuit board laminates, and other electronic components requiring enhanced flame retardancy.
• Lubricant & Hydraulic Fluid Additive: Functions as an anti-wear and extreme pressure additive in synthetic lubricants and industrial fluids.
• Plasticizer Precursor: Acts as an intermediate in the production of specialized phosphate-based plasticizers.

Basic Information

Product Name	4-Hydroxyphenyl Diphenyl Phosphate
CAS No.	56806-74-7
Molecular Formula	C18H15O5P
Molecular Weight	342.28 g/mol
Synonyms	Diphenyl 4-Hydroxyphenyl Phosphate; 4-Hydroxyphenyl Diphenyl Phosphate; Phenol, 4-hydroxy-, diphenyl phosphate; 1-Hydroxy-4-(diphenoxyphosphoryloxy)benzene; Phosphoric Acid, Diphenyl 4-Hydroxyphenyl Ester; FR-Synergist BDP-H; BDP-4OH; Reactive Phosphate Ester FR
EINECS	Contact for details

Quality Control

Our 4-Hydroxyphenyl Diphenyl Phosphate is produced under a strict quality management system. Each batch undergoes comprehensive analytical testing, including assay, identification, and impurity profile analysis, to ensure it meets precise customer specifications and industry standards. Certificates of Analysis (COA) documenting purity, physical properties, and test results are provided with every shipment and are available upon request.

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 material is hygroscopic (moisture-sensitive); keep the container tightly sealed to minimize exposure to atmospheric moisture.

Specification

Item	Specification
Appearance	White to off-white crystalline powder or flakes
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Melting Point	95 - 105 °C
Loss on Drying	≤ 0.5%
Related Substances (HPLC)	Total impurities ≤ 2.0%

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