Agent Name

Manganese(III) oxide

CAS Number

1317-34-6

Formula

Mn2-O3

Major Category

Metals

Synonyms

Manganese sesquioxide; Dimanganese trioxide; Manganese manganate; Manganese sisquioxide; Manganese trioxide; Manganese(3+) oxide; Manganic oxide; [ChemIDplus]

Category

Manganese Compounds, Inorganic

Description

Black solid, insoluble in water; [Merck Index]

Sources/Uses

Found in the mineral hausmannite; [Merck Index] Used to produce ceramic magnets and semiconductors; [Ullmann]

Comments

Fine dust is flammable; Toxic by inhalation; [Hawley] See "Manganese" and linked occupational diseases.

Exposure Assessment
TLV (ACGIH)

0.02 mg/m3, as Mn (respirable fraction), 0.1 mg/m3, as Mn (inhalable fraction)

PEL (OSHA)

Ceiling(OSHA)=5 mg/m3, as Mn

MAK

0.2 mg/m3, as Mn (inhalable fraction), 0.02 mg/m3, as Mn (respirable fraction)

Explanatory Notes

Decomposes at >900 deg C; [Ullmann]

Adverse Effects
Neurotoxin

Parkinson's Syndrome

Links to Other NLM Databases
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: