Label abbreviations descriptions

TUNGSTEN CARBIDE (CONTAINING >2% Co, as Co)†

Chemical Identification
CAS # 12070-12-1
Formula

WC/Co/Ti
Synonyms

cemented tungsten carbide; cemented WC; hard metal

Physical Properties
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

Monitoring Methods Used by OSHA
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.

Bulk/Wipe Method
Wipe Sampler/Sampling media
Bulk Method

On-Site Screening Techniques
Device
Model/Type
Sampling information
(see manufacturer instructions)

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
CAL/OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
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

Last Updated Date : 01/14/2021