Agent Name

Zirconium hydride

CAS Number

7704-99-6

Formula

H2-Zr

Major Category

Metals

Synonyms

Zirconium dihydride; Zirconium hydride (ZrH2); [ChemIDplus] UN1437

Category

Metals, Inorganic Compounds

Description

Grey-black metallic solid; [Merck Index] Dark grey odorless powder; [MSDSonline] Inert in air and water at room temperature; [Ullmann]

Sources/Uses

Used as a metal foaming agent, nuclear moderator, reducing agent, and catalyst; [Hawley] Has been used as a moderator in nuclear reactors; Also used in storage batteries; [Ullmann]

Comments

Dangerous fire risk; [Hawley] Highly flammable; A strong reducing agent; Reacts slowly with water forming zirconium hydroxide (caustic) and hydrogen gas (flammable); [CAMEO] Liberates extremely flammable gases on contact with water; An irritant; [MSDSonline] See "Zirconium."

Exposure Assessment
TLV (ACGIH)

5 mg/m3, as Zr

STEL (ACGIH)

10 mg/m3, as Zr

PEL (OSHA)

5 mg/m3, as Zr (compounds)

MAK

1 mg/m3, inhalable fraction (metal and insol. cmpds.)

IDLH (NIOSH)

25 mg/m3, as Zr

Links to Other NLM Databases
Toxicity Information

Search TOXNET

Chemical Information

Search ChemIDplus

Related Information in HazMap
Processes

Industrial Processes with risk of exposure: