E7B

E7B is a designation used to identify a specific type of rocket engine propellant. It is a hypergolic fuel, meaning it ignites spontaneously upon contact with an oxidizer. This property makes it highly reliable for ignition in rocket engines, as it eliminates the need for a separate ignition system. E7B is a mixture primarily composed of unsymmetrical dimethylhydrazine (UDMH) and hydrazine. These components are chosen for their stability, energy density, and compatibility with common rocket oxidizers, such as nitrogen tetroxide (NTO).

The use of hypergolic propellants like E7B offers significant advantages in certain aerospace applications. Their rapid and reliable ignition is crucial for spacecraft maneuvers, especially in situations where a quick and certain engine start is required, such as orbital insertion or emergency maneuvers. E7B has been employed in various launch vehicles and spacecraft systems throughout history. Its high performance and operational simplicity have made it a preferred choice for certain missions where dependability is paramount. However, like many hypergolic propellants, E7B is also highly toxic and requires careful handling and specialized safety protocols during storage, transportation, and use. The corrosive nature of these chemicals also necessitates the use of specific materials for fuel systems. The development and use of E7B are part of the broader field of chemical rocket propulsion, focusing on efficient and reliable energy conversion for spaceflight.