Fluorosulfonic acid
Also known as: Fluorosulfuric acid, Fluorosulphonic acid, Fluorosulphuric acid, Fluosulfonic acid, Fluosulfuric acid, Monofluorosulfuric acid, Sulfurofluoridic acid, HSO3F, sulfofluoride, epoxysulfonyl fluoride, perfluorosulfonic acid
Fluorosulfonic acid (CAS 7789-21-1) is a compound in the Inorganic Chemicals category listed in the Jingsj chemical database. It has the molecular formula FHO3S and a molecular weight of 100.070 g/mol. Key properties include a melting point of −87.3 °C(lit.), a boiling point of 165.5±9.0 °C at 760 mmHg and a density of 1.9±0.1 g/cm3. It is classified under GHS with signal word Danger and hazard statements H314 — Causes severe skin burns and eye damage and H332 — Harmful if inhaled. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 7789-21-1
- Jingsj CID
- J-26861-3
- Molecular Formula
- FHO3S
- Molecular Weight
- 100.070 g/mol
- Category
- Inorganic Chemicals
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | −87.3 °C(lit.) |
|---|---|
| Boiling Point | 165.5±9.0 °C at 760 mmHg |
| Density | 1.9±0.1 g/cm3 |
| Exact Mass | 99.963043 |
| PSA | 62.75000 |
| LogP | -0.16 |
| Additional Property | 3.5 (vs air) |
| Vapor Pressure | 0.9±0.6 mmHg at 25°C |
| Refractive Index | 1.392 |
GHS Safety & Compliance
- H314 — Causes severe skin burns and eye damage
- H332 — Harmful if inhaled
Frequently Asked Questions
What is the CAS number of Fluorosulfonic acid?
The CAS number of Fluorosulfonic acid is 7789-21-1.
What are the molecular formula and molecular weight of Fluorosulfonic acid?
Fluorosulfonic acid has molecular formula FHO3S and molecular weight 100.070 g/mol.
Is Fluorosulfonic acid hazardous?
Fluorosulfonic acid has GHS signal word Danger and hazard statements H314 — Causes severe skin burns and eye damage; H332 — Harmful if inhaled.
What are the upstream and downstream products of Fluorosulfonic acid?
For Fluorosulfonic acid, Upstream Products: HYDROFLUORIC ACID, 3,3,4,4-tetrafluoro-1,2-oxathietane 2,2-dioxide, 1,2,2-Trifluoro-2-hydroxy-1-(trifluoromethyl)ethanesulfonic acid sultone; Downstream Products: Propanoyl fluoride, p-Toluenesulfonyl fluoride, 2,2-Difluoroacetyl chloride.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Fluorosulfonic acid (CAS 7789-21-1)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-26861-3 (accessed 2026-11-06).
Data for reference only; verify product details with suppliers before purchase.