Fluorosulfonic acid
Agent Name
Fluorosulfonic acid
CAS Number
7789-21-1
Formula
F-H-O3-S
Major Category
Other Classes
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: