Have you ever heard about hybrid rockets? Some space company manufactures and uses this kind of rockets in small launches like delivering microsatellites in the orbit. this type of rocket is uncrewed and guided and is used for the test in microgravity conditions.
Yeah, that`s a small rocket that is made for some microgravity missions and experiments or delivers microsatellites into the orbit
I found about hybrid rocket which is called SkyHy rocket tells that this rocket uses ( as I have already mentioned ) solid Hydroxyl Terminated Polybutadiene (HTPB) fuel and 90% Hydrogen Peroxide (H202) liquid oxidizer.
Great Link. Did not know. Now I do.