Description

4-Hydroxyphenyl Phosphonic Acid is an organophosphorus compound featuring both phenolic and phosphonic acid functional groups, making it a versatile intermediate for synthesis and modification. This unique bifunctional structure is critical for creating materials with specific chelating, flame-retardant, or surface-active properties. It is essential for manufacturers and R&D teams in the polymer, pharmaceutical, and specialty chemical industries seeking to develop advanced functional materials.

Application

• Flame Retardant Synergist: Used as a reactive intermediate or additive in the production of flame-retardant polymers, plastics, and textiles.
• Metal Chelation & Scale Inhibition: Acts as a chelating agent in water treatment formulations to control scale and corrosion, particularly for calcium and iron ions.
• Pharmaceutical Intermediate: Serves as a key building block in the synthesis of bisphosphonate drugs and other bioactive molecules.
• Surface Modification Agent: Utilized to functionalize metal oxides and other surfaces, improving adhesion and compatibility in coatings and composites.
• Polymer Additive & Monomer: Incorporated into resins and adhesives to enhance thermal stability, adhesion, and cross-linking density.
• Agricultural Chemical Intermediate: Employed in the synthesis of certain herbicides and plant growth regulators.

Basic Information

Product Name	4-Hydroxyphenyl Phosphonic Acid
CAS No.	33795-18-5
Molecular Formula	C6H7O4P
Molecular Weight	174.09 g/mol
Synonyms	(4-Hydroxyphenyl)phosphonic Acid; p-Hydroxyphenylphosphonic Acid; Phenol, 4-phosphono-; HPPA; Phosphonic acid, P-(4-hydroxyphenyl)-; 4-Phosphonophenol; 4-Hydroxybenzenephosphonic Acid
EINECS	Contact for details

Quality Control

Our 4-Hydroxyphenyl Phosphonic Acid is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise specifications and is free from significant impurities. A comprehensive Certificate of Analysis (COA) detailing all test results is provided with every shipment to guarantee traceability and compliance with your requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This product is hygroscopic (moisture-sensitive) and light-sensitive; containers must be kept tightly sealed after opening to minimize exposure to atmospheric moisture and light.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 2.0%
Melting Point	Contact for details
Heavy Metals	< 20 ppm

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