Fired up this experimental kiln. It is made of steel flashing, 2" of ceramic fiber insulation all around. Fiber treated with rigidizer. ceramic button and anthill wire used to additionally secure the fiber to the lid. Steel bands make the handles and bottom rigid. At 1500 degrees F I could touch the exterior wall. It was tepid..like bath water. Not burning hot. Very happy with this. I will take it yo Antoinette's to use for demonstrating alternative firing processes.I have been thinking about making a small kiln like this for faster tests in alternative firing processes.