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Phosphonic acid, calcium salt (1:1)

CAS 21056-98-4

Molecular structure of 21056-98-4
1 Ca²⁺
US productionNot reported
Import value, 2024$19M
Top sourceChina 86%

This chemical is listed as active in US commerce, but no company reported it to EPA’s survey for 2019 or 2023. Sites may have made or imported less than the threshold amount, or none.

Why supply is unknown

Production is reported production, not a complete census of factories. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

Where It Comes From

Customs basis: HS 283510 · basket

These shares come from HS customs code 283510, which covers 15 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries
CN 86%ChinaCH 6%SwitzerlandIN 4%IndiaGB 3%United KingdomDE 1%Germany

Why It Matters

No EPA sector or FDA product records name a use for this chemical.

Chemical Identity

CAS21056-98-4
PubChem CIDNot recorded
DTXSIDDTXSID60885158
FormulaCaHO3P
Mol. Weight120.057 g/mol
SMILES[Ca++].[O-]P([O-])=O

Data Sources

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Brief citations

Phosphonic acid, calcium salt (1:1) (CAS 21056-98-4) https://chemicalindependence.com/chemical/21056-98-4/ EPA TSCA Inventory: CAS 21056-98-4. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory US Census international trade: HS 283510 for CAS 21056-98-4. Reporting year: 2024. https://usatrade.census.gov/