Chris Kott wrote:I think it important to mention context.
In the context of a food item, I would agree you don't want to pyrolise bread before you eat it.
But one doesn't eat refractory insulation, does one?
I would be very comfortable using perfectly pyrolised bread as refractory insulation in an RMH, as I am not intending to eat the refractory insulation, nor am I intending to take large hauls off of the chimney.
Finally, a use for wonderbread!
michael Egan wrote:It seems to me that the burnt toast is carbon... biochar... charcoal. If I'm correct and not missing something then any carbon substance could be an ingredient in an insulative mix as long as oxygen is not present in high enough amounts to trigger combustion at certain temperatures. That's basically what people were doing when they experimented with using sawdust in an insulation mix: the sawdust pyrolized and apparently stayed stable in a honeycomb kind of configuration but was also fragile which wouldn't matter if it were in between the firebox and the outer masonry skin of a heater.