PAC Database - Detailed Chemical Data

Chemical Identity
Chemical CAS# UN# Health Code Numbers
Calcium hydroxide 1305-62-0
14.01
4.01
11.01
14.02
11.00
4.07
3.09
3.02
3.10
4.11
Formula Synonyms
CaH2O2 CALCIUM HYDROXIDE, CALCIUM HYDRATE, CAUSTIC LIME, HYDRATED LIME, SLAKED LIME
Physical Properties
Mol Wt State MP (°C) BP (°C) VP (Hg) VP (°C) SG LEL (ppm)
74.1 S 2.343
PAC Values
PAC Values (Original Units: mg/m3)
PAC-1 PAC-2 PAC-3
15 240 1500
Converted PAC Values (ppm)
PAC-1 PAC-2 PAC-3
4.9 79 490
Technical Basis
A review of available data sources identified the following: TLV-TWA, rat oral LD50, and mouse oral LD50 toxicity data. Data sources were selected according to the hierarchy listed in Table 3.1. Toxicity data were selected according to the type of exposure, species, and route hierarchies stated in Sections 3.3.1, 3.3.2. The TLV-TWA was selected as the TEEL-1 basis. The rat oral LD50 was selected as the TEEL-3 basis, as the most preferred species available. The TEEL-2 was derived according to Table 3.5.
• TEEL-1 = TLV-TWA (5 mg/m3) x 3
• TEEL-2 = TEEL-3/6
• TEEL-3 = Rat oral LD50 (7340 mg/kg)
This review generated TEEL values that were consistent with those in Rev. 29A. Minor differences in the TEEL-2 and TEEL-3 ppm can be attributed to current calculations using unrounded values during conversion.
References
National Center for Biotechnology Information (2023). PubChem Compound Summary for CID 6093208, Slaked lime. Retrieved from https://pubchem.ncbi.nlm.nih.gov/compound/Slaked-lime
TLV-TWA, rat oral LD50 and mouse oral LD50 toxicity data: https://www.cdc.gov/niosh-rtecs/EW2AB980.html
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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.