PAC Database - Detailed Chemical Data

Chemical Identity
Chemical CAS# UN# Health Code Numbers
Hydrazine hydrochloride; (Hydrazine monochloride) 2644-70-4
14.01
11.01
14.02
11.00
8.00
7.01
4.05
4.09
4.10
4.06
Formula Synonyms
ClH5N2
Physical Properties
Mol Wt State MP (°C) BP (°C) VP (Hg) VP (°C) SG LEL (ppm)
68.52 S 89 1.5
PAC Values
PAC Values (Original Units: ppm)
PAC-1 PAC-2 PAC-3
0.14 1.5 8.9
Converted PAC Values (mg/m3)
PAC-1 PAC-2 PAC-3
0.39 4.2 25
Technical Basis
A review of available sources was unable to identify exposure limits for this chemical, but toxicity data was available. The two most preferable toxicity starting points, both from 1956, are dog intravenous LD50 and rat oral LD50. Dogs are the second most preferable animal species, while rats are the third (See Section 3.3.2). However, because the oral route is preferred to intravenous doses (See Section 3.3.2), the rat oral LD50 was selected as the TEEL-3 basis. TEEL-2 and TEEL-1 were calculated in accordance with guidelines in the handbook (Table 3.5.)

TEEL-1 = TEEL-2/11
TEEL-2 = TEEL-3/6
TEEL-3 = Rat, oral LD50 (128 mg/kg)

This review generated values that are slightly less conservative than those reported in Rev. 29A. In Rev. 29A, the TEEL-3 basis was a dog intravenous LD50, however the current recommendation of oral route of administration is of higher preference.
References
https://pubchem.ncbi.nlm.nih.gov/compound/115031#section=Acute-Effects
https://www.osha.gov/annotated-pels/table-z-1
https://www.cdc.gov/niosh/idlh/302012.html
https://chem.nlm.nih.gov/chemidplus/sid/0002644704
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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.