If u mix aluminum ( or aluminium, whichever) with broken metal, u create thermite, and same in real life, aluminum/ aluminium powder mixed with same amount of iron oxide (for all who don't know what that is, rust) u create thermite
think of it as like coal, it burns extremely slowly, but dosen't break itself, and creates large waves of pressure, kind of like model rockets, the fuel burns slowly, but with enough power to launch a small rocket up to about 1,000 feet
Solid rocket fuel is quite a fair ask. I would use solid rocket fuel often. But what happened to inventing things? I will say it again; ICE(GAS) works aethsetically - use property editor.