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Calcium Phosphite


Synonyms: Calcium phosphite Monohydrate; CaHPO3; CaHPO3.H2O; Phosphonic acid calcium salt; calcium hydrogen phosphonate monohydrate
CAS No.: 21056-98-4
EC No.:
Molecular Formula: CaHPO3.H2O
Molecular Weight: 138.08
M.p.: °C
B.p.: °C (anhydrous)
Solubility: Slightly soluble in water, practically insoulble in alcohol


Calcium phosphite is made by reaction between calcium hydroxide and phosphorous acid:

Ca(OH)2 + H3PO3 = CaHPO3.H2O + H2O


Calcium Phosphite Monohydrate is mainly used to prepare anti-rust coatings with properties of non-toxic, strong adhesion, good flexibility and strong hiding power. Calcium phosphite can also be used as fertilizer, food/feed additive, anti-oxidant and raw material for pharmaceuticals.


Appearance fine white powder
Content 98.0% min.
Chlorides 0.01% max.
Heavy Metals as Pb 5 ppm max.

Standard Packaging

50lbs, 25kgs, 500kg, 1000kgs bag

Risks and Safety Information

Calcium Phosphite is NOT regulated by UN as hazardous goods.

Keep bags tightly closed in dry and cool place, avoid direct sun-light.

Avoid contact with skin and eyes.

Avoid breathing dust.

Keep clear from drains.

No hazard

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