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.
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UDMH Specifications |
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Component |
% by Weight |
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1,1-dimethylhydrazine, min |
98.0 |
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Amines and water, max |
2.0 |
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Water, max |
1.5 |
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Aniline, max |
0.5 |
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UDMH Typical Physical Properties |
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Density |
@ 25ºC (g/ml) |
0.784 |
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@ 25ºF (lb/gal) |
6.6 |
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Viscosity |
@ 20ºC (cp) |
0.56 |
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Boiling Point |
@ 76 mm Hg (ºC) |
63 |
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@ 76 mm Hg (ºF) |
146 |
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Freezing Point |
(ºC) |
-57.2 |
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(ºF) |
-71 |
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Flash Point |
COC (ºC) |
-15 |
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COC (ºF) |
5 |
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Flammable Limits in Air |
(%by vol) |
2-95 |
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