Fluorosulfonic acid

CAS 7789-21-1

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 2019 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: 2019. 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 Not published · Imports Not published
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

Domestic parents -- activity not disclosed (1)

EPA records name a US company for this chemical but do not disclose whether the company made it here or imported it.

Honeywell International

Why It Matters

Sectors

Energy

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

•Catalyst in Petroleum Lubricating Oil and Grease ManufacturingProcessing as a reactant

Chemical Identity

CAS7789-21-1

PubChem CID24603

DTXSIDDTXSID3033511

FormulaFHO3S

Mol. Weight100.07 g/mol

SMILESOS(=O)(=O)F

Data Sources

EPA CompTox (DSSTox) · DTXSID3033511Retrieved 2026-04-06
PubChem · compound 24603Retrieved 2026-04-06
EPA Chemical Data ReportingReporting year: 2019 · 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

Fluorosulfonic acid (CAS 7789-21-1) https://chemicalindependence.com/chemical/7789-21-1/ EPA CompTox (DSSTox): DTXSID3033511. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID3033511 PubChem: 24603. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/24603 EPA Chemical Data Reporting: 7789-21-1. Reporting year: 2019. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 7789-21-1. Reporting year: 2019. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 281119 for CAS 7789-21-1. Reporting year: 2024. https://usatrade.census.gov/