| Agent Name |
Hafnium |
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| CAS Number |
7440-58-6 |
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| Formula |
Hf |
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| Major Category |
Metals |
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| Synonyms |
Celtium; Elemental hafnium; Hafnium metal; [NIOSH] |
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| Category |
Elements, Metallic |
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| Description |
Highly lustrous, ductile, grayish solid; [NIOSH] |
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| 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] |
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| 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] |
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| Reference Link |
OCCUPATIONAL SAFETY AND HEALTH GUIDELINE FOR HAFNIUM |
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| Exposure Assessment |
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| Skin Designation (ACGIH) |
No |
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| TLV (ACGIH) |
0.5 mg/m3 |
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| PEL (OSHA) |
0.5 mg/m3 |
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| IDLH (NIOSH) |
50 mg/m3 |
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| 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 . . . |
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| Explanatory Notes |
Hafnium powder is spontaneously combustible. [CAMEO] The Guide from the Emergency Response Guidebook is for "hafnium powder, dry." |
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| Adverse Effects |
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| Hepatotoxin |
Hepatotoxin, Secondary |
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| Links to Other NLM Databases |
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| Health Studies |
Human Health Effects from Hazardous Substances Data Bank: HAFNIUM
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