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Should be used for question pertaining to part of propellant that is used to ignite the fuel.
16
votes
Accepted
Other than He and N as pressurizing gases
at room temperature, polymerizes and releases hydrogen on heating, probably not safe to mix with oxidizer even if you could;
hydrogen cyanide (HCN): toxic, flammable, unsafe to mix with oxidizer, liquid … monoxide (CO): toxic, flammable, not safe to mix with oxidizer;
nitric oxide (NO): heavier than nitrogen, reactive, probably not safe to mix with either fuel or oxidizer;
oxygen (O2): good oxidizer, unsafe …