Cindy Mathieu wrote:The terra cotta pieces can stand the heat, but only if raised no more than 50°F per hour. Since a rocket heater gets hotter much faster than that, Santamax is recommending that you slit them and put some insulation around them for testing. The rockwool may or may not handle the temps making their way to the outside if used around the burn chamber of a j-tube. Ceramic fiber is the only thing which will definitely not disintegrate.
Cindie, you often speak out loud, but you still haven't tried rockwool?
Note to self: don't get into a fist fight with a cactus. Command this tiny ad to do it:
2021 RMH Jamboree planning thread!https://permies.com/wiki/148835/permaculture-projects/RMH-Jamboree-planning-thread