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The 400N engine uses the storable propellants Monomethylhydrazine MMH as fuel and pure Dinitrogen Tetroxide N2O4 or Mixed Oxides of Nitrogen (MON-1, MON-3) as oxidizer. It is designed for long term steady state operation. It operates in a wide pressure range at regulated pressure mode.
The combustion chamber and a part of the nozzle are made of platinum alloy. That does not require surface coating, thereby allowing operational wall temperature up to 1.600°C (2.900°F) and thus maximum engine performance. The engine can be provided with supporting structure and thermal shield as completely assembled module on customer request.