PAC Database - Detailed Chemical Data
Chemical Identity
| Chemical | CAS# | UN# | Health Code Numbers | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Calcium sulfide | 20548-54-3 |
|
||||||||||
| Formula | Synonyms | |||||||||||
| CaS | ||||||||||||
Physical Properties
| Mol Wt | State | MP (°C) | BP (°C) | VP (Hg) | VP (°C) | SG | LEL (ppm) |
|---|---|---|---|---|---|---|---|
| 72.14 | S | 2524 | 2.58 |
PAC Values
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 1.2 | 13 | 79 |
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 0.41 | 4.4 | 27 |
Technical Basis
A review of available sources did not identify exposure limits or acute toxicity data for calcium sulfide. SAX's Dangerous Properties of Industrial Materials classifies calcium sulfide as an HHR=3; this classification is supported by literature that indicates hydrogen sulfide is generated from inorganic salts, resulting in similar toxic effects. As such, analysts assumed an HHR=3 as the TEEL-3 basis (Section 3.4.5). TEEL-2 and TEEL-1 values were derived according to Table 3.5.
• PAC-1 = TEEL-1 = TEEL-2/11
• PAC-2 = TEEL-2 = TEEL-3/6
• PAC-3 = TEEL-3 = HHR=3
This review generated PAC values inconsistent with Rev. 29A. The Rev. 29A TEEL-3 basis was an assumed HHR=2, while the current TEEL-3 basis is an assumed HHR=3, in agreement with the recommended health hazard rating of SAX’s Dangerous Properties of Industrial Materials (12th edition, 2012). The Rev. 29A and current TEEL-2 and TEEL-1 use the same methodology, with differences due to the change in TEEL-3.
• PAC-1 = TEEL-1 = TEEL-2/11
• PAC-2 = TEEL-2 = TEEL-3/6
• PAC-3 = TEEL-3 = HHR=3
This review generated PAC values inconsistent with Rev. 29A. The Rev. 29A TEEL-3 basis was an assumed HHR=2, while the current TEEL-3 basis is an assumed HHR=3, in agreement with the recommended health hazard rating of SAX’s Dangerous Properties of Industrial Materials (12th edition, 2012). The Rev. 29A and current TEEL-2 and TEEL-1 use the same methodology, with differences due to the change in TEEL-3.
References
Chemical information: https://comptox.epa.gov/dashboard/chemical/details/DTXSID30885140
Discussion of spontaneous H2S formation (see Section 2.1.1): A. Martelli, et. al, Pharmacological Research, Volume 196, 2023. https://doi.org/10.1016/j.phrs.2023.106947
Hydrogen sulfide toxicological profile: https://www.atsdr.cdc.gov/toxprofiles/tp114.pdf
SAX's Dangerous Properties of Industrial Materials, 12th ed., Richard J. Lewis. John Wiley & Sons, Inc., Hoboken, NJ (2012).