HAFNIUM & COMPOUNDS†
| Chemical Identification | |
|---|---|
| CAS # | 7440-58-6 |
| Formula |
Hf |
| Synonyms |
Celtium; elemental hafnium; hafnium metal |
| Physical Properties | |||
|---|---|---|---|
| Physical description | Highly lustrous, ductile, grayish solid. | ||
| Boiling point | 8316°F | Molecular weight | 178.5 |
| Freezing point/melting point | 4041°F | Vapor pressure | 0 mmHg (approx) |
| Flash point | Vapor density | ||
| Specific gravity | 13.31 | Ionization potential | |
| Lower explosive limit (LEL) | Upper explosive limit (UEL) | ||
| NFPA health rating | NFPA fire rating | ||
| NFPA reactivity rating | NFPA special instruction | ||
| Vapor hazard ratio (VHR) | |||
| Historical exceedance percentage | |||
| Target organs | |||
| Monitoring Methods Used by OSHA | ||||||
|---|---|---|---|---|---|---|
| Analyte code (IMIS no.) | 1368 | |||||
| Sampling group | ||||||
| Sampler/Sampling media | Pre-assembled cassette with mixed cellulose ester filter (MCEF) 0.8 micron (37 mm) [MAWP037A0] | |||||
| Sampling time* | 480 min |
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| Sampling volume (TWA)* | 960 L |
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| Sampling flow rate (TWA)* | 2 L/min |
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| Sampling volume (STEL/Peak/C)* | ||||||
| Sampling flow rate (STEL/Peak/C)* | ||||||
| Analytical method instruments | AAS | |||||
| Method reference | OSHA ID-121 (fully validated) | |||||
| Notes | OSHA staff to call the SLTC prior to sampling for detailed instructions. |
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| Special requirements | ||||||
* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.
| Wipe Method | |
|---|---|
| Sampler/Sampling media | |
| Bulk Method |
|---|
| On-Site Screening Techniques | ||||||
|---|---|---|---|---|---|---|
| Device | ||||||
| Model/Type | ||||||
|
Sampling information (see manufacturer instructions) |
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| Exposure Limits | |||||||
|---|---|---|---|---|---|---|---|
|
OSHA PEL
8-hour TWA (ST) STEL (C) Ceiling Peak |
NIOSH REL
Up to 10-hour TWA (ST) STEL (C) Ceiling |
ACGIH TLV©
8-hour TWA (ST) STEL (C) Ceiling |
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| PEL-TWA |
0.5 mg/m³ |
REL-TWA |
0.5 mg/m³ |
TLV-TWA |
0.5 mg/m³ [1990] |
PEL-TWA |
0.5 mg/m³ |
| PEL-STEL | REL-STEL | TLV-STEL | PEL-STEL | ||||
| PEL-C | REL-C | TLV-C | PEL-C | ||||
| Skin notation |
N |
Skin notation |
N |
Skin notation |
N |
Skin notation |
N |
| Notes: | Notes: | Notes: | Notes: | ||||
| Health factors: See NIH-NLM PubChem. | IDLH |
50 mg/m³ |
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| Carcinogenic classifications: Not listed | Notes: | ||||||
| AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3: | |||||||
| Additional Resources and Literature References |
|---|
|
NOAA: CAMEO Chemicals - Hafnium powder, dry NIOSH: Pocket Guide to Chemical Hazards - Hafnium Literature References
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Last Updated Date : 12/29/2020