PAC Database - Detailed Chemical Data

Chemical Identity
Chemical CAS# UN# Health Code Numbers
Cesium hydroxide 21351-79-1 2682
14.01
14.02
11.00
4.01
11.01
4.08
7.01
8.00
7.00
4.07
Formula Synonyms
CsHO CAESIUM HYDROXIDE, CAESIUM HYDROXIDE, SOLUTION, CESIUM HYDRATE, CESIUM HYDROXIDE, CESIUM HYDROXIDE DIMER, HIDRÓXIDO DE CESIO (DOT SPANISH), HYDROXYDE DE CAESIUM (DOT FRENCH), HYDROXYDE DE CÉSIUM (DOT FRENCH)
Physical Properties
Mol Wt State MP (°C) BP (°C) VP (Hg) VP (°C) SG LEL (ppm)
149.9127 S deliq 315 3.675
PAC Values
PAC Values (Original Units: mg/m3)
PAC-1 PAC-2 PAC-3
6.0 19 110
Converted PAC Values (ppm)
PAC-1 PAC-2 PAC-3
0.98 3.1 18
Technical Basis
A review of available sources identified exposure limits (STEL, TWAs) and acute toxicity data (LD50) for several routes and species. Data sources were selected according to the hierarchy listed in Table 3.1. Toxicity data were selected according to type of exposure, species, and route according to the hierarchies stated in Sections 3.3.1, 3.3.2, and evaluated using factors in Tables 3.2, 3.3, and 3.4. The most preferred species and route, a rat oral LD50, was selected as the TEEL-3. TEEL-2 values were derived according to Table 3.5. The TLV-TWA was selected as the TEEL-1 basis.
• PAC-1 = TEEL-1 = TLV-TWA x 3 (2 mg/m3)
• PAC-2 = TEEL-2 = TEEL-3/6
• PAC-3 = TEEL-3 = Rat oral LD¬50 (570 mg/kg)
This review generated PAC values consistent with Rev. 29A*.
References
Chemical info: https://pubchem.ncbi.nlm.nih.gov/compound/Cesium-hydroxide
TLV-TWA: https://www.osha.gov/chemicaldata/311
OELs: https://ilv.ifa.dguv.de/limitvalues/9398
LD50 rat oral 570 mg/kg: Gigiena Truda i Professional'nye Zabolevaniya. Labor Hygiene and Occupational Diseases., 21(1)(29), 1977. Retrieved from: https://pubchem.ncbi.nlm.nih.gov/compound/Cesium-hydroxide
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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.