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Perfluorobutanesulfonic acid

CAS 375-73-5

1-Butanesulfonic acid, 1,1,2,2,3,3,4,4,4-nonafluoro-

Molecular structure of 375-73-5
US productionNot reported
Import value, 2024$9M
Top sourceChina 53%

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 290499 · basket

These shares come from HS customs code 290499, which covers 112 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries
CN 53%ChinaIN 30%IndiaUA 4%UkraineTW 4%TaiwanIT 4%Italy

Why It Matters

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

Chemical Identity

CAS375-73-5
PubChem CIDNot recorded
DTXSIDDTXSID5030030
FormulaC4HF9O3S
Mol. Weight300.09 g/mol
SMILESOS(=O)(=O)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F

Data Sources

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Brief citations

Perfluorobutanesulfonic acid (CAS 375-73-5) https://chemicalindependence.com/chemical/375-73-5/ EPA TSCA Inventory: CAS 375-73-5. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory US Census international trade: HS 290499 for CAS 375-73-5. Reporting year: 2024. https://usatrade.census.gov/