Description

Orthophosphorus Acid CAS NO 10294-56-1 is a high-purity inorganic acid, also known as phosphorous acid, valued for its role as a versatile intermediate and reducing agent. It is essential for industries requiring precise chemical synthesis and material modification. This product is primarily needed by manufacturers in water treatment, agriculture, flame retardants, and specialty chemical synthesis.

Application

• Water Treatment Chemical: Used as a scale and corrosion inhibitor in industrial cooling and boiler water systems.
• Flame Retardant Precursor: A key intermediate in the synthesis of organophosphorus flame retardants for plastics and textiles.
• Agricultural Intermediate: Employed in the production of phosphonate-based herbicides, fungicides, and plant growth regulators.
• Reducing Agent: Utilized in chemical synthesis and metal surface treatment processes where controlled reduction is required.
• Pharmaceutical & Food Industry: Serves as a starting material or processing aid in the synthesis of certain pharmaceuticals and food-grade additives.
• Stabilizer for Polymers: Acts as a co-stabilizer in PVC and other polymers to prevent thermal degradation.

Basic Information

Product Name	Orthophosphorus Acid
CAS No.	10294-56-1
Molecular Formula	H3PO3
Molecular Weight	82.00 g/mol
Synonyms	Phosphorous Acid; Orthophosphorous Acid; Phosphonic Acid; Dihydroxyphosphine Oxide; Fosforzuuroplossingen; Phosphonate; Hydrogen Phosphonate; Trihydroxyphosphine
EINECS	233-663-1

Quality Control

Our Orthophosphorus Acid is produced under a stringent quality management system. Each batch undergoes comprehensive analytical testing to ensure it meets precise specifications for purity, identity, and impurity profiles. Certificates of Analysis (COA) documenting results for key parameters such as assay, heavy metals, and clarity of solution are available upon request to support your quality assurance protocols.

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); ensure containers are kept sealed to prevent absorption of atmospheric moisture.

Specification

Item	Specification
Appearance	White crystalline solid or colorless solution
Identification (IR)	Conforms
Assay (H3PO3)	≥ 98.0 %
Clarity of Solution	Clear
Heavy Metals (as Pb)	≤ 10 ppm
Iron (Fe)	≤ 5 ppm
Chloride (Cl)	≤ 10 ppm
Sulfate (SO4)	≤ 20 ppm

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