PAC Database - Detailed Chemical Data
Chemical Identity
| Chemical | CAS# | UN# | Health Code Numbers | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ferrous disulfide; (Iron disulfide) | 12068-85-8 |
18.00
4.00
3.00
|
||||||||||
| Formula | Synonyms | |||||||||||
| FeS2 | ||||||||||||
Physical Properties
| Mol Wt | State | MP (°C) | BP (°C) | VP (Hg) | VP (°C) | SG | LEL (ppm) |
|---|---|---|---|---|---|---|---|
| 119.97 | S | 5.2 |
PAC Values
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 1.2 | 13 | 79 |
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 0.24 | 2.6 | 16 |
Technical Basis
A review of available sources did not identify exposure limits or acute toxicity data for ferrous disulfide. SAX's Dangerous Properties of Industrial Materials classifieds ferrous disulfide 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. The TEEL-2 and TEEL-1 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-1 basis was a TLV-TWA for particles not otherwise specified (Section 3.5.2), from which the TEEL-2 and TEEL-3 were derived (Table 3.5). The current TEEL-3 basis is an assumed HHR=3, from which the TEEL-2 and TEEL-1 values were derived.
• 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-1 basis was a TLV-TWA for particles not otherwise specified (Section 3.5.2), from which the TEEL-2 and TEEL-3 were derived (Table 3.5). The current TEEL-3 basis is an assumed HHR=3, from which the TEEL-2 and TEEL-1 values were derived.
References
Chemical information: https://comptox.epa.gov/dashboard/chemical/details/DTXSID801014311
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).