Main Page | See live article | Alphabetical index Unsymmetrical dimethylhydrazine (UDMH) (1,1-Dimethylhydrazine) is a hypergolic rocket fuel ingredient, often used in combination with the oxidiser, nitrogen tetroxide. UDMH is toxic, and can explode in the presence of oxidisers. External links http://www.astronautix.com/props/n2o4udmh.htm This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.