Fluorosulfonic acid

Agent Name
Fluorosulfonic acid
CAS Number
7789-21-1
Formula
F-H-O3-S
Major Category
Other Classes
Fluorosulfonic acid formula graphical representation
Synonyms
Fluorosulfuric acid; Fluosulfonic acid; Fluosulfuric acid; Monofluorosulfuric acid; Fluorosulphuric acid; [ChemIDplus] UN1777
Category
Organic Acids
Description
Colorless liquid that fumes in moist air; [Merck Index] Colorless to light yellow liquid with a choking odor; [CHRIS]
Sources/Uses
Used in the chemical industry as a fluorinating agent and catalyst; Used in electropolishing; [HSDB]
Comments
Highly corrosive to skin; [Quick CPC] Reacts with water producing hydrofluoric acid and sulfuric acid; [HSDB] Corrosive to skin, eyes, and respiratory tract; Inhalation may cause pulmonary edema; [ICSC] See the Process, "Toxic Gas from Spilling Chemical in Water."
Biomedical References

Exposure Assessment

TIH
Yes
Dangerous When Wet
Yes
Vapor Pressure
2.5 mm Hg
Explanatory Notes
Not TIH in land-based spills, but TiH substance released when spilled in water; [ERG 2016]
ERPG-1
2 mg/m3
ERPG-2
10 mg/m3
ERPG-3
30 mg/m3

Adverse Effects

Toxic Pneumonitis
Yes
Dermatotoxin
Skin burns

Diseases, Processes, and Activities Linked to This Agent

Diseases

Occupational diseases associated with exposure to this agent:

Processes

Industrial Processes with risk of exposure: