Calcium hypophosphite, with CAS No. 7789-79-9, has a solubility of 16.7 g/ml (20℃) and is used in flame retardants, animal feed additives, and fertilizers. Its main raw materials are sodium hypophosphite and calcium chloride. The standard electrode potential of calcium hypophosphite is E°≈ -0.51 V, making it an excellent reducing agent with better stability than sodium hypophosphite. It decomposes at high temperatures into pH₃, phosphate, and calcium salts, classifying it as a Class 4.1 flammable solid. It can form complexes with metal ions and is used in electroplating and metal surface treatment. Its aqueous solution is weakly acidic due to the hydrolysis of H₂PO₂⁻.

I. Basic Parameters

English Name: Calcium hypophosphite

Chemical Formula: Ca(H2PO2)2

CAS NO.: 7789-79-9

EINECS: 232-190-8

Molecular Weight: 170.06

Stability: Stable in dry air; decomposes above 300℃, releasing highly toxic pH₃

Properties: Calcium hypophosphite is a white crystalline powder, soluble in water, insoluble in alcohol. Its solubility in water at room temperature is 16.7 g/100 g water. Its aqueous solution is weakly acidic.

II. Main Indicators

Ca(H2PO2)2%≥98.0%

Arsenic(As)%≤0.0004%

Lead(Pb)%≤0.0001%

Barium(Ba)%≤0.005%

Water-insoluble matter%≤0.5%

Appearance: White powder

III. Uses

Calcium hypophosphite is used as a flame retardant, in chemical plating, food additive, and animal nutrition agent. It is also used in pharmaceutical manufacturing and as an antioxidant and analytical reagent.

IV. Safety Information

Hazard Classification: According to GHS standards, calcium hypophosphite is classified as a flammable solid (Category 2), hazardous if ingested (Category 4), and may cause severe eye irritation (Category 2).

Hazard Statements:

H228: Flammable solid

H302: Hazardous if ingested

H319: Causes severe eye irritation

Precautions: Wear appropriate protective equipment during handling and strictly avoid contact with heat sources, sparks, and open flames.

V. Packaging and Storage

Net weight 25kg kraft paper bag, lined with a polyethylene bag. Calcium hypophosphite must be stored in a sealed container in a dry, dark, and cool place.

Calcium hypophosphite has a certain flame-retardant effect in PA (polypropylene). It features strong reducing power, high flame-retardant efficiency, low smoke and low toxicity, wide application range, and good compatibility with substrates. It can also be used as an antioxidant, plastic modifier, and filler to improve product performance or reduce costs.