UDMH

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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