Chemical Safety Program: PACs for Chemicals of Concern

PAC Database - Detailed Chemical Data

Chemical Identity

Chemical	CAS#	Health Code Numbers
Hydrazine hydrate; (Hydrazine monohydrate; aqueous solutions - 10217-52-4)	7803-57-8	7.00 7.01 6.00 14.01 11.01 14.02 11.00 4.05 4.06 4.07
Formula	Synonyms
H4.N2.H2.O

Physical Properties

Mol Wt	State	MP (°C)	BP (°C)	VP (Hg)	VP (°C)	SG	LEL (ppm)
50.08	L	-51.7	119			1.03 @ 21°C

PAC Values

PAC Values (Original Units: ppm)
PAC-1	PAC-2	PAC-3
0.10	13	35

Converted PAC Values (mg/m3)
PAC-1	PAC-2	PAC-3
0.20	27	72

Technical Basis

Hydrazine hydrate is a mixture of hydrazine and water. A review of available sources identified did not identify exposure limits or acute toxicity data for this chemical. Instead, AEGLs for a similar chemical, hydrazine (CASRN: 302-01-2) were evaluated for TEEL development. These AEGLs were selected due to their priority among Protective Action Criteria (Section 1).
• PAC-1 = AEGL-1 (hydrazine, CASRN: 302-01-2)
• PAC-2 = AEGL-2 (hydrazine, CASRN: 302-01-2)
• PAC-3 = AEGL-3 (hydrazine, CASRN: 302-01-2)
This review generated PAC values inconsistent with Rev. 29A; the Rev. 29A and current sources are consistent, AEGLs for hydrazine (CASRN: 302-01-2). Differences in reported values are due to Rev. 29A applying a molecular weight adjustment; the current ppm values are unmodified, per Section 3.2.2.

References

Chemical information: https://pubchem.ncbi.nlm.nih.gov/compound/Hydrazine-hydrate

AEGLs, hydrazine (CASRN: 302-01-2) (Table 6-1) retrieved from: https://www.epa.gov/aegl/hydrazine-results-aeglprogram

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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.