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T1 Hydrazine Health and Safety Guide - Health and Safety Guide 56
A1 United Nations Environment Programme, 
A1 World Health Organization, 
A1 International Labour Organisation, 
K1 health
K1 health hazard
K1 guideline
K1 chemical safety
K1 chemical
SN 92 4 151056 0
YR 1991
FD 1991
LK https://wedocs.unep.org/handle/20.500.11822/29643
UL https://wedocs.unep.org/handle/20.500.11822/29643
NO Anhydrous hydrazine, and aqueous solutions, are colourless liquids. Anhydrous hydrazine is a caustic, fuming, hygroscopic liquid at normal temperature and pressure. It has an ammoniacal, fishy, and pungent odour. The odour perception threshold is 4-9 mg/rn . A 1:1 mixture of anhydrous hydrazine in water (hydrazine monohydrate) containing 64% by weight of hydrazine, fumes slightly in air and has an ammoniacal odour. Hydrazine is infinitely soluble in water and may be flammable and explosive up to a concentration of 400 gilitre (40%). Hydrazine is basic, and is a strong reducing agent.
DS UN Environment Document Repository
RD Sep 21, 2026