FHO3S
100.07 g/mol
Industrial ChemicalDanger
Fluorosulfonic acid
CAS7789-21-1EC232-149-4
Category
Industrial Chemical
Compound Class
Other
Primary Use
Fluorinating agent and catalyst
Fluorosulfonic acid is an inorganic compound and one of the strongest commercially available acids. It is structurally related to sulfuric acid, with a fluorine atom replacing one hydroxyl group, giving it a tetrahedral molecular geometry.
Fluorinating agentCatalyst
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
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Related Compounds
ReferenceSame Category
Potassium fluoride
CAS7789-23-3
Silver soldering fluxes and glass etching
ReferenceSame Category
Potassium bifluoride
CAS7789-29-9
etchant for glass
ReferenceSame Category
Sodium bromate
CAS7789-38-0
oxidizing agent in industrial processes
ReferenceSame Category
Calcium bromide
CAS7789-41-5
Drilling fluids and brine applications
Safety Reference
Danger
H314Causes severe skin burns and eye damage
H332Harmful if inhaled
H318Causes serious eye damage
H371May cause damage to organs
Regulatory Compliance1
- CN Catalogue of Hazardous ChemicalsCNRegulation
Customs Tariff Classification
The international HS code for Fluorosulfonic acid (CAS 7789-21-1) is 2811.19.
HS code (international, 6-digit)
2811.19
EU CN code (8-digit)
2811 19 80
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
Identifiers
IUPAC Name
sulfurofluoridic acid
InChIKey
UQSQSQZYBQSBJZ-UHFFFAOYSA-N
SMILES
OS(=O)(=O)F
Synonyms (12)
- FLUOSULFONIC ACID
- Fluorosulfonic acid
- Fluorosulfuric acid
- Fluorosulfuric acid (HSO3F)
- Fluorosulphonic acid
- Fluorosulphuric acid
- Fluosulfuric acid
- Monofluorosulfuric acid
- sulfofluoran
- sulfurofluoridic acid
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