Unsymmetrical Dimethylhydrazine (UDMH)

Unsymmetrical dimethylhydrazine (1,1-dimethylhydrazine) is a clear, colorless hygroscopic liquid. It has an ammonia-like odor which closely resembles that of aliphatic amines. UDMH is miscible with water, hydrazine, dimethylhydrazine, ethanol, amines and most petroleum fuels.

UDMH is mildly alkaline and is a very strong reducing agent. Its high chemical reactivity, easily-controlled functionality and strong hydrogen bonding are its most useful properties.

UDMH Specifications
Component(% by Weight)
1,1-dimethylhydrazine, min98.0
Amines and water, max2.0
Amines, max1.5
Water, max0.5


UDMH Typical Physical Properties
Density@ 25°C (g/ml)0.784
@ 25°F (lb/gal)6.6
Viscosity@ 20°C (cp)0.56
Boiling Point@ 760 mm Hg (°C)63
@ 760 mm Hg (°F)146
Freezing Point(°C)-57.2
(°F)-71
Flash PointCOC (°C)-15
COC (°F)5
Flamable Limits in Air(% by vol)2-95

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