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TUNGSTEN CARBIDE (CONTAINING >2% Co, as Co)†
| CAS # | 12070-12-1 |
|---|---|
| Formula |
WC/Co/Ti |
| Synonyms |
cemented tungsten carbide; cemented WC; hard metal |
| Physical description | A mixture of tungsten carbide, cobalt, and sometimes other metals & metal oxides or carbides. | ||
|---|---|---|---|
| Boiling point | 10832°F | Molecular weight | 195.86 |
| Freezing point/melting point | 4946-5126°F | Vapor pressure | 4 mmHg |
| Flash point | Vapor density | ||
| Specific gravity | 15.6 at 64°F | 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 | |||
| Analyte code (IMIS no.) | 0720 |
|---|---|
| Sampling group | |
| Sampler/Sampling media | Pre-assembled cassette with mixed cellulose ester filter (MCEF) 0.8 micron (25 or 37 mm) [MAWP025A0 or MAWP037A0] |
| Sampling time* | 240 min |
| Sampling volume (TWA)* | 480 L |
| Sampling flow rate (TWA)* | 2 L/min |
| Sampling volume (STEL/Peak/C)* | 30 L |
| Sampling flow rate (STEL/Peak/C)* | 2 L/min |
| Analytical method instruments | ICP |
| Method reference | OSHA ID-213 (fully validated) |
| Notes | Air sampling of cemented tungsten carbides and tungsten alloy matrices may contain cobalt; these should be sent to the lab to be analyzed for cobalt and tungsten by ID-213. |
| 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 Sampler/Sampling media | |
|---|---|
| Bulk Method |
| Device | |||||
|---|---|---|---|---|---|
| Model/Type | |||||
|
Sampling information (see manufacturer instructions) |
|
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 |
|||||
|---|---|---|---|---|---|---|---|
| PEL-TWA |
0.1 mg Co/m³ |
REL-TWA |
0.05 mg Co/m³ |
TLV-TWA |
0.005 mg/m³ (thoracic particulate matter) [2015] |
PEL-TWA |
0.02 mg Co/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:
As Co. See 29 CFR 1910.1000 Table Z-1. |
Notes:
See Appendix C, Supplementary Exposure Limits, Tungsten Carbide (Cemented). |
Notes:
respiratory sensitization (RSEN) |
Notes:
as Co |
||||
| Health factors: See NIH-NLM PubChem. | IDLH | ||||||
| Carcinogenic classifications: IARC-2B; TLV-A2 | Notes: | ||||||
| AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3: | |||||||
Additional Resources and Literature References
|
NOAA: CAMEO Chemicals - Tungsten carbide NIOSH: Pocket Guide to Chemical Hazards - Tungsten carbide (cemented) Literature References
|
Last Updated Date : 01/14/2021