Aerozine 50 (50% N₂H₄ + 50% (CH₃)₂NNH₂) is a hypergolic fuel blend propellant used as a fuel. Storable for years at ambient temperature. Typical ISP: 285–315 s (with NTO) seconds.
Aerozine 50 is a 50/50 mixture by weight of hydrazine and UDMH, developed to combine the best properties of both fuels. It was the standard fuel for the Titan family of launch vehicles and the Apollo Lunar Module descent and ascent engines. Aerozine 50 provides better performance than UDMH alone while maintaining better stability than pure hydrazine.
Developed for the Titan II ICBM and later used on Titan III/IV and Apollo LM engines. Production ended with Titan IV retirement.
Better performance than UDMH alone, better stability than hydrazine, proven reliability
Extremely toxic, carcinogenic, environmental hazard, costly handling
