Description

Phosphorous Acid is a powerful reducing agent and intermediate with significant industrial utility. Its unique chemical properties make it a critical component for synthesizing high-value phosphonates and stabilizing materials against oxidative degradation. This compound is essential for manufacturers in the water treatment, agriculture, and polymer industries seeking effective and reliable chemical solutions for their processes.

Application

• Primary Intermediate for Phosphonates: Key raw material for producing HEDP, ATMP, and other scale and corrosion inhibitors used in industrial water treatment and oilfield applications.
• Agricultural Chemicals: Used in the synthesis of herbicides, fungicides, and plant growth regulators, where it acts as a precursor and stabilizing agent.
• Polymer Stabilization: Functions as a reducing agent and antioxidant in the production of plastics, synthetic fibers, and other polymers to prevent thermal and oxidative degradation.
• Pharmaceutical Intermediates: Serves as a building block in the synthesis of certain active pharmaceutical ingredients (APIs) and fine chemicals.
• Metal Surface Treatment: Employed in plating baths and metal finishing processes for cleaning and surface preparation.
• Laboratory Reagent: Used in analytical chemistry and research as a specialized reducing agent and standard.

Basic Information

Product Name	Phosphorous Acid
CAS No.	13598-36-2
Molecular Formula	H3PO3
Molecular Weight	82.00 g/mol
Synonyms	Phosphonic Acid; Orthophosphorous Acid; Dihydroxyphosphine oxide; Phosphorus(+3) Acid; Phosphonate; Phosphorus Trihydroxide; Phosphorus(III) Acid; Phosphonous Acid
EINECS	237-066-7

Quality Control

Our Phosphorous Acid is manufactured under a stringent quality management system to ensure batch-to-batch consistency and reliability. We provide comprehensive Certificates of Analysis (COA) with each shipment, detailing purity, assay, and impurity profiles. Our quality protocols are designed to meet the rigorous demands of industrial and specialty chemical applications.

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 bases and oxidizing agents. Due to its nature as a strong acid/organic solvent and being easily oxidized, it is recommended to store under an inert atmosphere for long-term stability. Optimal storage temperature is between 15°C and 25°C.

Specification

Item	Specification
Appearance	White crystalline solid or colorless solution
Identification (IR)	Conforms
Assay (H3PO3)	≥ 98.0 %
Phosphoric Acid (H3PO4)	≤ 1.0 %
Water (Karl Fischer)	≤ 0.5 %
Chloride (Cl)	≤ 50 ppm
Sulfate (SO4)	≤ 100 ppm
Heavy Metals (as Pb)	≤ 10 ppm

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