Agent Name

Hafnium

CAS Number

7440-58-6

Formula

Hf

Major Category

Metals

Synonyms

Celtium; Elemental hafnium; Hafnium metal; [NIOSH]

Category

Elements, Metallic

Description

Highly lustrous, ductile, grayish solid; [NIOSH]

Sources/Uses

Used to make high-temperature alloys, control rods for nuclear reactors, light bulb filaments, capacitors, cemented carbide tools, coatings for rocket engine parts, TV tubes, and x-ray tubes; [Reference #1]

Comments

The liver and lungs may be affected by heavy or prolonged exposures; [ICSC] Mild irritants to the eyes, nose, and respiratory tract; No reported industrial poisonings; [Reference #1]

Reference Link

Occupational Safety and Health Guideline for Hafnium

Exposure Assessment
Skin Designation (ACGIH)

Insufficient data

TLV (ACGIH)

0.5 mg/m3, as Hf

PEL (OSHA)

0.5 mg/m3, as Hf

IDLH (NIOSH)

50 mg/m3, as Hf

Excerpts from Documentation for IDLHs

No inhalation toxicity data are available on which to base an IDLH for hafnium compounds. Therefore, the revised IDLH for hafnium compounds is 50 mg Hf/m3 based on acute oral toxicity data in animals . . .

Explanatory Notes

Hafnium powder is spontaneously combustible. [CAMEO] The Guide from the Emergency Response Guidebook is for "hafnium powder, dry."

Adverse Effects
Hepatotoxin

Hepatotoxin, Secondary

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
Diseases

Occupational diseases associated with exposure to this agent:

Processes

Industrial Processes with risk of exposure: