Hypophosphorous acid has one hydroxyl group that can ionize in water, making it a monocarboxylic acid with strong reducing properties. It reacts with oxidants and alkaline chemicals such as sodium hydroxide, potassium hydroxide, and calcium hydroxide. Hypophosphorous acid is widely used in chemical plating solutions, intermediates, alkyd resin color-reducing agents, and hypophosphite production. Due to its +1 low-valent phosphorus content, it undergoes electron transfer, resulting in strong reducing properties.

I. Basic Information

English Name: Hypophosphorous acid(HPA)

Chemical Formula: H3PO2

Molecular Weight: 66

CAS Number: 6303-21-5

HS Code: 2811199090

Appearance: Colorless transparent liquid

Solubility: Miscible with water in any proportion

Stability: When exposed to strong heat or contact with oxidants, hypophosphorous acid decomposes to produce PH3, phosphoric acid, phosphorous acid, and hydrogen gas.

II. Key Indicators

H3PO2≥50.0%

H3PO3≤0.3%

Na≤0.25%

Fe≤0.0005%

Cl≤0.015%

Color: 30 APHA

Density: 1.210-1.265 g/ml

III. Packaging and Storage

25 kg or 250 kg/drum; store separately from strong alkalis, oxidants, and other chemicals; store in a cool, dry, and well-ventilated warehouse, avoiding prolonged direct sunlight.

The effective content of hypophosphoric acid is generally 50% or less; higher content leads to easy volatilization. Shelf life is 1 year. The main raw material for hypophosphoric acid production is sodium hypophosphorous acid. The production process generates a significant amount of wastewater, placing considerable environmental pressure on the industry. Price trends are influenced by various factors. Currently, major manufacturers are located domestically, while overseas demand is substantial. Export requires commodity inspection and dangerous goods packaging; there is no export tax rebate.