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."

Exposure Assessment
Dangerous When Wet

Yes - A material that, by contact with water, is liable to become spontaneously flammable or to give off flammable or toxic gas at a rate greater than 1 L per kilogram of the material, per hour; [ERG 2004]

Vapor Pressure

2.5 mm Hg

Adverse Effects
Toxic Pneumonitis

Yes

Dermatotoxin

Skin Burns

Links to Other NLM Databases
Health Studies

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Toxicity Information

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Chemical Information

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Related Information in HazMap
Diseases

Occupational diseases associated with exposure to this agent:

Processes

Industrial Processes with risk of exposure: