TUNGSTEN, METAL & INSOLUBLE COMPOUNDS (as W)†

Chemical Identification
Chemical Identification
CAS # 7440-33-7
Formula

W

Synonyms

tungsten metal; wolfram. Synonyms vary depending upon the specific insoluble tungsten compound.

Physical Properties
Physical Properties
Physical description Hard, brittle, steel-gray to tin-white solid.
Boiling point 10,701°F Molecular weight 183.9
Freezing point/melting point 6170°F Vapor pressure 0 mmHg (approx)
Flash point Vapor density
Specific gravity 19.3 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
Monitoring Methods Used by OSHA
Analyte code (IMIS no.) 2536
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

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 specific form, valence state, 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.

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
Wipe Method
Sampler/Sampling media

Wipe with Whatman smear tab. [WHA1450993]

Bulk Method
Bulk Method

Available

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

5 mg/m³ (Construction and Maritime only)

REL-TWA

5 mg/m³

TLV-TWA

3 mg/m³ (respirable particulate matter): Tungsten [7440-33-7] and compounds, in the absence of Cobalt, as W [2016]. 0.005 mg/m³ (thoracic particulate matter): Hard metals containing Cobalt [7440-48-4] and Tungsten carbide [12070-12-1], as Co [2015].

PEL-TWA

5 mg/m³

PEL-STEL REL-STEL

10 mg/m³

TLV-STEL PEL-STEL

10 mg/m³

PEL-C REL-C TLV-C PEL-C
Skin notation

N

Skin notation

N

Skin notation

N

Skin notation

N

Notes:

See 29 CFR 1926.55 Appendix A and 29 CFR 1915.1000 Table Z-Shipyards.

Notes:

The REL also applies to other insoluble tungsten compounds (as W).

Notes:

respiratory sensitization (RSEN)

Notes:
Health factors:  See NIH-NLM PubChem. IDLH
Carcinogenic classifications: Notes:
AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:
Additional Resources and Literature References
Additional Resources and Literature References

NOAA: CAMEO Chemicals - Tungsten

NIOSH: Pocket Guide to Chemical Hazards - Tungsten

Literature References

  • ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Tungsten [7440-33-7] and compounds, in the absence of Cobalt, as W. See annual publication for most recent information.

Last Updated Date : 01/14/2021