Sulfurous acid, potassium salt (1:1)

CAS 7773-03-7

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$4M

Top sourceItaly 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 283220 · basket

EPA reports by year

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

These shares come from HS customs code 283220, which covers 11 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).

IT 46%ItalyCN 33%ChinaDE 18%GermanyIN 1%IndiaNZ 1%New Zealand

Denmark
Hong Kong
Japan
Spain

EPA-registered manufacturers (4)

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

Tessenderlo Group Nv/Sa · BE Belgium

Hydrite Chemical

Pvs Chemical Solutions

Tessenderlo Kerley

Why It Matters

Sectors

AgricultureFoodConsumer Products

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 3 sectors as 2 functional roles.

•Corrosion inhibitors and anti-scaling agents in Wholesale and Retail Trade (100%)Processing as a reactant
•Soil amendments (fertilizers) in Agriculture, Forestry, Fishing and Hunting (89%)Processing—repackaging
•Soil amendments (fertilizers) in Pesticide, Fertilizer, and Other Agricultural Chemical Manufacturing (95%)Processing as a reactant

Chemical Identity

CAS7773-03-7

PubChem CID23663620

DTXSIDDTXSID6064795

FormulaHKO3S

Mol. Weight120.17 g/mol

SMILESOS(=O)[O-].[K+]

Data Sources

EPA CompTox (DSSTox) · DTXSID6064795Retrieved 2026-04-06
PubChem · compound 23663620Retrieved 2026-04-06
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04
EPA Chemical Data ReportingReporting year: 2019 · Retrieved 2026-10-04
US Census international tradeReporting year: 2024 · Retrieved 2026-10-04

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Brief citations

Sulfurous acid, potassium salt (1:1) (CAS 7773-03-7) https://chemicalindependence.com/chemical/7773-03-7/ EPA CompTox (DSSTox): DTXSID6064795. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID6064795 PubChem: 23663620. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/23663620 EPA Chemical Data Reporting: 7773-03-7. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 7773-03-7. Reporting year: 2019. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 283220 for CAS 7773-03-7. Reporting year: 2024. https://usatrade.census.gov/