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Phosphates and phosphorus salts

Calcium phosphite

Also known as Phosphonic acid, calcium salt (1:1), Ekisupato 1020c, Secondary calcium phosphite

CAS 21056-98-4Formula CaO3P+Molar mass 119.05 g/molEC 244-182-1
GHS signal word: Warning. Pictograms: Harmful or irritant 3 suppliers listed
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Calcium phosphite chemical structure, CaO3P+, CAS 21056-98-4
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
21056-98-4
Formula
CaO3P+
Molar mass
119.05 g/mol
EC number
244-182-1
HS code
283510
Category
Phosphates and phosphorus salts

What is Calcium phosphite?

Plain description, key identifiers and synonyms

Calcium phosphite is a chemical substance with the molecular formula CaO3P+ and a molar mass of 119.05 g/mol. Its CAS registry number is 21056-98-4.

Identifiers

Registry numbers, names and line notations, tap to copy

CAS number
21056-98-4 CAS number cross-checked
EC number
244-182-1
Molecular formula
CaO3P+
UNII
0NI2DC6M5T
InChIKey
XTQCTYCLKSNIDH-UHFFFAOYSA-M
InChI
InChI=1S/Ca.HO3P/c;1-4(2)3/h;(H,1,2,3)/q+2;/p-1
SMILES (canonical and isomeric)
[O-]P(=O)=O.[Ca+2]

Synonyms

  • Phosphonic acid, calcium salt (1:1)
  • Ekisupato 1020c
  • Secondary calcium phosphite
  • Calcium phosphite (cahpo3)
  • Calcium monohydrogen phosphite
  • Calcium phosphonate (cahpo3)
  • Calcium hydrogen phosphite (cahpo3)
  • Phosphonic acid calcium salt (1:1)
  • Phosphorous acid, calcium salt (1:1)
  • Calcium hydrogen phosphonate

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

No measured properties are recorded for this substance yet. Ask suppliers for a technical data sheet.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
119.05 g/molcalc.
Exact mass
118.9205 Dacalc.
LogP (octanol/water)
-0.95calc.
Topological polar surface area
57.2 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
3calc.
Rotatable bonds
0calc.
Heavy atoms
5calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0calc.
Formal charge
1calc.
Stereocentres
0calc.
Components
2calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Warning
GHS07: Harmful or irritant
Harmful or irritant

Hazard statements

  • H315Causes skin irritation.
  • H319Causes serious eye irritation.
Precautionary statements (9)
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P302 + P352If on skin: Wash with plenty of water.
  • P305 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P332 + P317If skin irritation occurs: Get medical help.
  • P337 + P317If eye irritation persists: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Calcium phosphite suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 3 suppliers

Suppliers marked Unclaimed profile have not claimed their profile yet. They are not verified by CompoundList, their offers are price on request and details may have changed, so please confirm them with the supplier. Company representatives can claim a profile with a business email on the company's own website domain. Our team verifies each claim and sends the result by email.

Where suppliers are based

3 suppliers in 2 countries

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Calcium phosphite price

Indicative price range per kg from live supplier offers

No published prices right now

Suppliers quote this chemical on request. Send one free request and compare quotes side by side.

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Uses and applications

What the substance is used for, by industry and function

Applications are not documented for this substance yet. Suppliers often describe uses on their product pages, linked in the suppliers list above.

Regulatory status

Inventories, regulations and trade controls that list this substance

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Calcium phosphite is traded under.

HS 2835.10Indicative HS code

Phosphinates (hypophosphites) and phosphonates (phosphites)

World exports in 2024
$168M
+1.4% vs 2023, imports $163M
2019 to 2024
Top exporters
  1. China69.2%
  2. United States6.5%
  3. Switzerland * partner reported4.5%
Top importers
  1. United States12.5%
  2. Germany10.9%
  3. Malaysia9.8%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Calcium phosphite is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Calcium phosphite, based on the data on this page

What is Calcium phosphite?

Calcium phosphite is a chemical substance with the molecular formula CaO3P+ and a molar mass of 119.05 g/mol. Its CAS registry number is 21056-98-4.

What is the CAS number of Calcium phosphite?

The CAS registry number of Calcium phosphite is 21056-98-4.

What is the molecular formula and weight of Calcium phosphite?

The molecular formula of Calcium phosphite is CaO3P+ and its molar mass is 119.05 g/mol.

Is Calcium phosphite hazardous?

Calcium phosphite carries the GHS signal word "Warning". Main hazards: causes skin irritation, causes serious eye irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Calcium phosphite?

Calcium phosphite is usually classified under HS code 283510 (Phosphinates (hypophosphites) and phosphonates (phosphites)). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Calcium phosphite?

CompoundList lists 3 suppliers of Calcium phosphite in China and United States. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Calcium phosphite?

Suppliers quote Calcium phosphite on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Calcium phosphite

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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