COBALT METAL, DUST & FUME (as Co)†
Chemical Identification | |
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CAS # | 7440-48-4 |
Formula |
Co |
Synonyms |
cobalt metal dust; cobalt metal fume; cobalt metal powder; elemental cobalt |
Physical Properties | |||
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Physical description | Odorless, silver-gray to black solid. | ||
Boiling point | 5612°F | Molecular weight | 58.9 |
Freezing point/melting point | 2719°F | Vapor pressure | 0 mmHg (approx) |
Flash point | Vapor density | ||
Specific gravity | 8.92 | 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 | ||||||
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Analyte code (IMIS no.) | 0720 | 0720 | ||||
Sampling group | METALSSG-2 | |||||
Sampler/Sampling media | Pre-assembled cassette with mixed cellulose ester filter (MCEF) 0.8 micron (25 or 37 mm) [MAWP025A0 or MAWP037A0] | Pre-assembled cassette with mixed cellulose ester filter (MCEF) 0.8 micron (37 mm) [MAWP037A0] | ||||
Sampling time* | 240-480 min |
240 min |
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Sampling volume (TWA)* | 480-960 L |
480 L |
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Sampling flow rate (TWA)* | 2 L/min |
2 L/min |
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Sampling volume (STEL/Peak/C)* | ||||||
Sampling flow rate (STEL/Peak/C)* | ||||||
Analytical method instruments | ICP | ICP | ||||
Method reference | OSHA ID-125G (fully validated) | OSHA ID-213 (fully validated) | ||||
Notes | Results are provided for the presence and amount or concentration of a specific element or elements. The stated identity of the actual sample contents (such as a specific form or compound) is based on the assumption that the material sampled is as identified by the compliance officer using available documentation of materials and processes. The physical form of a sample (dust, mist, or fume) is identified by the compliance officer using available documentation of materials and processes. |
Results are provided for the presence and amount or concentration of a specific element or elements. The stated identity of the actual sample contents (such as a specific form or compound) is based on the assumption that the material sampled is as identified by the compliance officer using available documentation of materials and processes. The physical form of a sample (dust, mist, or fume) is identified by the compliance officer using available documentation of materials and processes. |
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Special requirements | For the entire suite of analytes listed in METALSSG-2, request analyte code 2587. |
For cobalt in cemented tungsten carbide or tungsten alloy matrices. |
* 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 | |
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Sampler/Sampling media | Wipe with Whatman smear tab. [WHA1450993] |
Bulk Method |
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Available |
On-Site Screening Techniques | ||||||
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Device | ||||||
Model/Type | ||||||
Sampling information (see manufacturer instructions) |
Exposure Limits | |||||||
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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 |
0.1 mg/m³ |
REL-TWA |
0.05 mg/m³ |
TLV-TWA |
0.02 mg/m³ (inhalable particulate matter) (cobalt [7440-48-4] and inorganic compounds, as Co) [2018] |
PEL-TWA |
0.020 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:
DSEN; RSEN; BEI®. Also refer to TLV: 0.005 mg/m³, respiratory sensitizer (RSEN), TLV-A2, BEI®; (hard metals containing cobalt [7440-48-4]) and tungsten carbide [12070-12-1], as Co) [2015] |
Notes: | ||||
Health factors: See NIH-NLM PubChem. | IDLH |
20 mg/m³ |
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Carcinogenic classifications: TLV-A3, IARC-2B | Notes: | ||||||
AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3: |
Additional Resources and Literature References |
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NOAA: CAMEO Chemicals - Cobalt NIOSH: Pocket Guide to Chemical Hazards - Cobalt metal dust and fume (as Co) Literature References
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Last Updated Date : 12/21/2020