TANTALUM, METAL & OXIDE †

Chemical Identification
Chemical Identification
CAS # 7440-25-7
Formula

Ta

Synonyms

tantalum metal: Tantalum-181. Synonyms of other tantalum dusts (including oxide dusts) vary depending upon the specific compound.

Physical Properties
Physical Properties
Physical description Steel-blue to gray solid or black, odorless powder.
Boiling point 9797°F Molecular weight 180.9
Freezing point/melting point 5425°F Vapor pressure 0 mmHg (approx)
Flash point Vapor density
Specific gravity 16.65 (metal) 14.40 (powder) 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.) 2325 (total); request using analyte code 9135
Sampling group
Sampler/Sampling media Tared low-ash 37 mm PVC filter, 5 microns [SLTC108]
Sampling time*

240-480 min

Sampling volume (TWA)*

960 L

Sampling flow rate (TWA)*

2 L/min

Sampling volume (STEL/Peak/C)*
Sampling flow rate (STEL/Peak/C)*
Analytical method instruments Gravimetric
Method reference OSHA PV2121 (partially validated)
Notes

Samples are analyzed gravimetrically. Results will be qualified based on the assumption that the material sampled is as identified by the compliance officer using available documentation of materials and processes; no further work on the sample will be performed due to method limitations. 

Special requirements

FOR TOTAL DUST SAMPLES, DO NOT USE A CYCLONE!!

* 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

5 mg/m³

TLV-TWA

Withdrawn in 2010 for insufficient data.

PEL-TWA

5 mg/m³

PEL-STEL REL-STEL

10 mg/m³

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

N

Skin notation

N

Skin notation

NA

Skin notation

N

Notes:

See 29 CFR 1910.1000 Table Z-1.

Notes: Notes: Notes:
Health factors:  See NIH-NLM PubChem. IDLH

2500 mg/m³

Carcinogenic classifications: Not listed 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 - Tantalum (metal and oxide dust)

NIOSH: Pocket Guide to Chemical Hazards - Tantalum (metal and oxide dust)

Literature References

  • ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Appendix G: Substances Whose Adopted Documentation and TLVs Were Withdrawn For a Variety of Reasons, Including Insufficient Data, Regrouping, Etc. Tantalum [7440-25-7] and Tantalum oxide [1314-61-0] dusts, as Ta. See annual publication for most recent information.

Last Updated Date : 01/22/2021