PAC Database - Detailed Chemical Data

Chemical Identity
Chemical CAS# UN# Health Code Numbers
Ammonium hydroxide 1336-21-6 2672
14.01
4.01
11.01
14.02
4.08
4.05
11.00
4.09
4.10
4.07
Formula Synonyms
H5NO AMMONIUM HYDROXIDE, AMMONIA WATER, AMMONIA, AQUA, AMMONIA, MONOHYDRATE, AQUA AMMONIA, HIDRÓXIDO DE AMONIO (DOT SPANISH), HYDROXYDE D^AMMONIUM (DOT FRENCH), AMMONIUM HYDROXIDE, [WITH < 12% AMMONIA], AMMONIA SOLUTION, AMMONIUM HYDROXIDE (<28% AQUEOUS AMMONIA)
Physical Properties
Mol Wt State MP (°C) BP (°C) VP (Hg) VP (°C) SG LEL (ppm)
35.046 L -77 36 2160 25 0.9
PAC Values
PAC Values (Original Units: ppm)
PAC-1 PAC-2 PAC-3
30 160 1100
Converted PAC Values (mg/m3)
PAC-1 PAC-2 PAC-3
43 230 1600
Technical Basis
A review of available sources identified the following: AEGL values for ammonia (CASRN: 7664-41-7). It was determined that these are appropriate as exposure limits for ammonium hydroxide, as the primary inhalation hazard from this chemical.
TEEL-1 = AEGL-1 (ammonia, CASRN: 7446-41-7)
TEEL-2 = AEGL-2 (ammonia, CASRN: 7446-41-7)
TEEL-3 = AEGL-3 (ammonia, CASRN: 7446-41-7)
This review generated TEEL values that are inconsistent with those in Rev. 29A. The Rev. 29A and current bases are consistent (ammonia AEGLs), however the Rev. 29A AEGL values were molecular weight adjusted. According to Section 3.2.2, AEGL should not be adjusted, therefore the current TEELs are the unadjusted AEGLs.
References
https://www.epa.gov/aegl/ammonia-results-aegl-program
https://pubchem.ncbi.nlm.nih.gov/compound/Ammonium-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.