Phosphorous acid

CAS 10294-56-1

U.S. production volumes are classified as confidential business information.

US productionCBI

Confidential Business Information. The EPA withholds this volume because publishing it could reveal the reporting company's trade secrets.

Import value, 2024$66M

Top sourceChina 46%

At least one company claimed its 2023 production or import volume for this chemical as confidential, so EPA withholds it.

Why supply is unknown

Production is reported production, not a complete census of factories. US production volume is confidential. Production reporting year: 2023. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

Where It Comes From

Customs basis: HS 281119 · basket

EPA reports by year

2023: US production Confidential · Imports Confidential
2019: US production Confidential · Imports Confidential

These shares come from HS customs code 281119, which covers 30 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries

Country of origin for US imports, from Census customs data (2024).

CN 46%ChinaDE 17%GermanyMY 12%MalaysiaKR 5%South KoreaTW 5%Taiwan

Japan
Netherlands
Switzerland
Norway
Jordan
Italy
Czech Republic
United Kingdom

EPA-registered manufacturers (2)

Companies that report making or importing this chemical to the EPA. Registration is US-centric and does not indicate import origin.

Arxada

Buckman Laboratories

EPA-registered importers (4)

Companies that report making or importing this chemical to the EPA. Registration is US-centric and does not indicate import origin.

Italmatch Chemicals Spa · IT Italy

Brenntag

Italmatch Usa

Newmarket

Why It Matters

Sectors

EnergyMetals & MiningCore Chemicals

Downstream UsesNot recorded

FDA Shortage Status

Whether any manufacturer currently reports this drug as in shortage on the FDA Drug Shortages database. "Active Shortage" means at least one presentation has status "current."

No FDA shortage records

Industrial Uses

Used in 4 sectors as 3 functional roles.

•Anti-scaling agent in All Other Chemical Product and Preparation Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product
•Intermediate in All Other Basic Inorganic Chemical Manufacturing (100%)Processing as a reactant
•Intermediate in Miscellaneous Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product
•Stabilizing agent in Petroleum Lubricating Oil and Grease Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product

Chemical Identity

CAS10294-56-1

PubChem CID107909

DTXSIDDTXSID7035511

FormulaH3O3P

Mol. Weight81.996 g/mol

SMILESOP(O)O

Data Sources

EPA CompTox (DSSTox) · DTXSID7035511Retrieved 2026-04-06
PubChem · compound 107909Retrieved 2026-04-06
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04
US Census international tradeReporting year: 2024 · Retrieved 2026-10-04

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Brief citations

Phosphorous acid (CAS 10294-56-1) https://chemicalindependence.com/chemical/10294-56-1/ EPA CompTox (DSSTox): DTXSID7035511. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID7035511 PubChem: 107909. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/107909 EPA Chemical Data Reporting: 10294-56-1. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 10294-56-1. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 281119 for CAS 10294-56-1. Reporting year: 2024. https://usatrade.census.gov/