Thanks for the informative posts

I made my own rocket stove out of cookie can ( 10 inches high by 6 inch diameter ). It's Ok for a first timer.

Main problem I saw is that the sides heat up alot. That is unsafe to touch and also wastes energy , so the nest step is to find another bigger can and make a double wall stove with some insulation in between. Now, what on Earth can be poured in there that can withstand the heat and gives good insulation ? Weight is not a problem because the whoile thing is not that big.

I thought about cement or mud. Does anyone know enough about making mud sticky enough to be poured there and just left to dry and stay in one piece ? Is it better to pout the mud or cement and leave it to dry naturally or should I fire up the stove to dry the mud/cement quickly ?

Thanks