Results of the 8" batch box thingy at the Innovators Gathering

Just want to say if you work Ceramic Fiber Blanket into the build that the stove will be more efficient and burn hotter!?

in the first post on this thread there is a layer by layer layout - the second layer is a white board - what is that board made out of? it looks like the door is also made of this material (at least it is looks like a white board) - is this the same?

If I remember correctly, it's 1/2" ceramic fibre board. The makeshift door was also out of the same material. This type of board tended to shrink quite  a bit, the bottom layer is probably up for replacement right now and other parts as well. This experimental heater is in function since september 2014.

Edit:
The white material turned out to be calcium silicate board, I just checked my posts from back then. At present, I'd regard this material as "handy to experiment with" but by no means suitable for a permanent installation. The door gave way a long time ago but there are more parts in there of the same material. Of course one could choose to use it anyway and do a rebuild every 5 years or so.

A look at the rocket mass heater that was before in the classroom:

Bump to these thoughts, I am curious always about four year old review of said materials.

Anyone here with an opinion about calcium silicate board  used in these ways?  Even if only 3 to 5 years efficacy,  are they safe to use without respirator and hazmat suits?  I am reading some results, but often the serpent lurks in that tree of life...