PAC Database - Detailed Chemical Data

Chemical Identity
Chemical CAS# UN# Health Code Numbers
Potassium oxide 12136-45-7
14.01
14.02
11.00
Formula Synonyms
K2.O
Physical Properties
Mol Wt State MP (°C) BP (°C) VP (Hg) VP (°C) SG LEL (ppm)
94.1794 S
PAC Values
PAC Values (Original Units: mg/m3)
PAC-1 PAC-2 PAC-3
0.18 2.0 54
Converted PAC Values (ppm)
PAC-1 PAC-2 PAC-3
0.047 0.52 14
Technical Basis
A review of available sources did not identify exposure limits for potassium oxide. Instead, potassium hydroxide (KOH, CASRN: 1310-58-3) was evaluated as a structurally similar chemical, due to its formation when potassium oxide is exposed to water and its similarly caustic qualities (Section 3.4.6). 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. A rat oral LD50 for potassium hydroxide was selected as the TEEL-3 basis. A TLV-C for potassium hydroxide was selected as the TEEL-2. The TEEL-1 was derived according to Table 3.5.
• TEEL-1 = TEEL-2/11
• TEEL-2 = TLV-C (potassium hydroxide, CASRN: 1310-58-3)
• TEEL-3 = Rat oral LD50 (potassium hydroxide, CASRN: 1310-58-3, 273 mg/kg)
This review generated TEEL values that are consistent with Rev. 29A*.
References
Chemical information: https://webbook.nist.gov/cgi/cbook.cgi?ID=12136457&Mask=FFFF&Units=SI
Rat oral LD50 for KOH; Fundamental and Applied Toxicology., 8(97), 1987. Retrieved from: https://pubchem.ncbi.nlm.nih.gov/compound/Potassium-Hydroxide.
TLV-C for KOH. Retrieved from: https://www.osha.gov/chemicaldata/210
Description of potassium and its oxides retrieved from: John S. DeLaHunt and Theodore G. Lindeman. Journal of Chemical Health & Safety 2007 14 (2), 21-32 https://pubs.acs.org/doi/10.1016/j.jchas.2006.09.010
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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.