Agent Name

Oleum

CAS Number

8014-95-7

Formula

H2-O4-S.O3-S

Major Category

Toxic Gases & Vapors

Synonyms

Fuming sulfuric acid; Oleum; Oleum iodisum; Sulfur trioxide, mixt. with sulfuric acid; Sulfuric acid fuming; Sulfuric acid mixture with sulfur trioxide; Sulfuric acid, mixt with sulfur trioxide; [ChemIDplus] UN1831

Category

Acids, Inorganic

Description

Colorless to brown, fuming, viscous, and hygroscopic liquid; [ICSC]

Sources/Uses

Used to make surfactants, dyes, nitrocellulose, explosives, and caprolactam; Also used in petroleum refining and as a drying agent for chlorine & nitric acid; [HSDB] Oleum is a solution of sulfur trioxide in 100% sulfuric acid used in the synthesis of organic chemicals; [Britannica]

Comments

Highly corrosive to skin; [Quick CPC] A corrosive substance that can cause pulmonary edema; May cause erosion of teeth enamel; [ICSC] Can cause severe burns of the skin and eyes; [CAMEO] See "Sulfuric acid."

Exposure Assessment
TLV (ACGIH)

0.2 mg/m3, thoracic fraction

PEL (OSHA)

1 mg/m3

MAK

0.1 mg/m3, inhalable fraction

IDLH (NIOSH)

15 mg/m3

Lethal Concentration

LC50 (rat) = 347 ppm/1h

Explanatory Notes

Cancer designations refer to sulfuric acid contained in strong inorganic acid mists; [ACGIH]

Adverse Effects
Toxic Pneumonitis

Yes

Dermatotoxin

Skin Burns

IARC Carcinogen

Known Carcinogen

NTP Carcinogen

Human Carcinogen

ACGIH Carcinogen

Suspected Human

Links to Other NLM Databases
Health Studies

Human Health Effects from Hazardous Substances Data Bank:

Toxicity Information

Search TOXNET

Chemical Information

Search ChemIDplus

Related Information in HazMap
Processes

Industrial Processes with risk of exposure: