Aerozine 50
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Aerozine 50 is a 50/50 mix of hydrazine and unsymmetrical dimethyl hydrazine (UDMH). It is used as a rocket fuel, typically with dinitrogen tetroxide as the oxidizer, with which it is hypergolic (ignites on contact). Aerozine 50 is more stable than hydrazine alone, but has a higher density and boiling point than UDMH alone.
This type of fuel is mainly used for interplanetary probes and spacecraft propulsion systems, because rockets and spacecraft using it can stay fueled indefinitely. This is not true with most rockets. In some cases, it is used in ground launched rockets, such as Titans and second stages of Deltas (with the exception of the Delta IV.
