1. OSHA Occupational Chemical Database
  2. MOLYBDENUM, SOLUBLE COMPOUNDS
Label abbreviations descriptions

MOLYBDENUM, SOLUBLE COMPOUNDS†

Chemical Identification
Chemical Identification
CAS # 7439-98-7
Formula

Mo
Synonyms

molybdenum metal
Physical Properties
Physical Properties
Physical description Dark gray or black powder with a metallic luster.
Boiling point 8717°F Molecular weight 95.9
Freezing point/melting point 4752°F Vapor pressure 0 mmHg (approx)
Flash point Vapor density
Specific gravity 10.28 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.) 1791
Sampling group
Sampler/Sampling media Pre-assembled cassette with mixed cellulose ester filter (MCEF) 0.8 micron (37 mm) [MAWP037A0]
Sampling time*

240 min
Sampling volume (TWA)*

480-960 L
Sampling flow rate (TWA)*
 

2 L/min
Sampling volume (STEL/Peak/C)*
 

 
Sampling flow rate (STEL/Peak/C)*
 

 
Analytical method instruments ICP
Method reference OSHA ID-125G (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.

Analysis for this analyte is based on water solubility.
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
 

 
Bulk Method
Bulk Method
 

 
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

 REL-TWA
 

 

 TLV-TWA
 

0.5 mg/m³ (respirable particulate matter) [1999]

 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
 

NA

 Skin notation
 

N

 Skin notation
 

N
Notes:
 

See 29 CFR 1910.1000 Table Z-1.

 Notes:
 

See Appendix D - Substances with No Established RELs.

 Notes:
 

 

 Notes:
 

See footnote [n].
Health factors:  See NIH-NLM PubChem. IDLH
 

1000 mg/m³
Carcinogenic classifications: TLV-A3 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 - Molybdenum

NIOSH: Pocket Guide to Chemical Hazards - Molybdenum (soluble compounds, as Mo)

Literature References

 
  • ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Molybdenum, as Mo. See annual publication for most recent information.

Last Updated Date : 01/05/2021