PAC Database - Detailed Chemical Data

Chemical Identity
Chemical CAS# UN# Health Code Numbers
Cobalt 7440-48-4 1325
11.01
4.08
8.00
11.00
4.09
4.10
4.07
3.08
2.00
Formula Synonyms
Co COBALT, ACO 4, AQUACAT, C.I. 77320, C.I. 77320, CO 0138E, COBALT ELEMENT, COBALT FULLERIDE (COC20), COBALT METAL DUST, COBALT METAL FUME, COBALT-59, NCI-C60311, SUPER COBALT
Physical Properties
Mol Wt State MP (°C) BP (°C) VP (Hg) VP (°C) SG LEL (ppm)
58.93 S 1495 2927 1517 8.86
PAC Values
PAC Values (Original Units: mg/m3)
PAC-1 PAC-2 PAC-3
0.060 2.0 20
Converted PAC Values (ppm)
PAC-1 PAC-2 PAC-3
0.025 0.83 8.3
Technical Basis
A review of available sources identified multiple exposure limits: TLV-TWA, Level of Concern (LOC), and IDLH. The IDLH was selected as the TEEL-3. There was no change of the IDLH value between the original (1990) and revised values (1994). The 1987 LOC was selected as the TEEL-2. This LOC is based on 10% of the IDLH from the 1970’s, which remains current. The TLV-TWA was selected as the TEEL-1 basis.
• TEEL-1 = TLV-TWA x 3 (0.02 mg/m3)
• TEEL-2 = LOC (1987, 2 mg/m3)
• TEEL-3 = IDLH (1990/1994, 20 mg/m3)
This review generated TEEL-3 and TEEL-2 values that are consistent with Rev. 29A. The current TEEL-1 is based on an exposure limit and results in a more conservative value.
References
National Center for Biotechnology Information (2023). PubChem Compound Summary for CID 104730, Cobalt. Retrieved from https://pubchem.ncbi.nlm.nih.gov/compound/Cobalt.
https://www.cdc.gov/niosh/idlh/7440484.html
Appendix C, pg. C-3; https://www.epa.gov/sites/default/files/2015-09/documents/technical_guidance_for_hazard_analysis.pdf
https://www.osha.gov/chemicaldata/539
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PAC values marked with a subscript "A" correspond to 60-minute AEGL values.
PAC values marked with a subscript "E" correspond to ERPG values.
PAC values marked by * are >= 10% lower explosive limit (LEL) but < 50% LEL.
PAC values marked by ** are > 50% LEL but < 100% LEL.
PAC values marked by *** are >= LEL.