Agent Name

Molybdenum hexafluoride

CAS Number

7783-77-9

Formula

F6-Mo

Major Category

Metals

Synonyms

Molybdenum fluoride (MoF6), (OC-6-11)-; [ChemIDplus] Molybdenum (VI) fluoride; UN3289; [Alfa Aesar]

Category

Metals, Inorganic Compounds

Description

White volatile solid; Very hygroscopic; Hydrolyzed by water; Evolves blue-white clouds in moist air; [Merck Index] Light yellow liquid; Melting point = 17.5 deg C; [MSDSonline]

Sources/Uses

Used to separate molybdenum isotopes; [Hawley]

Comments

Reacts with water evolving toxic gases; A corrosive substance that can cause injury to the skin, eyes, and respiratory tract; Inhalation may cause chemical pneumonitis; [MSDSonline] See "Molybdenum." See "FLUORIDES."

Exposure Assessment
BEI

Fluorides in urine = 2 mg/L prior to shift or 3 mg/L at end of shift; (Repeated measurements recommended.)

TLV (ACGIH)

2.5 mg/m3, as F 0.5 mg/m3, respirable fraction, as Mo)

PEL (OSHA)

2.5 mg/m3, as F (5 mg/m3 as Mo)

MAK

1 mg/m3, inhalable fraction, as F

IDLH (NIOSH)

250 mg/m3, as F

Lethal Concentration

LC50 (rat) = 333 mg/m3

Explanatory Notes

ERG Guide is for "Toxic liquid, corrosive, inorganic, n.o.s." For TLV, see "Molybdenum and compounds."

Adverse Effects
Toxic Pneumonitis

Yes

Dermatotoxin

Skin Burns

Links to Other NLM Databases
Toxicity Information

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Chemical Information

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Related Information in HazMap
Other Information

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