![]() So this is a little off the wall, but I was thinking about these high temperature burn chamber materials currently being used and I don't think they are quite there yet because the operating temperatures are on the upper threshold for these commercially available materials. ![]() Vermiculite is made from a type of feldspar which is actually very good for high temp construction, it is chemically similar to the clays used for ceramics. Some folks however don't know the difference between agricultural vermiculite and concrete aggregate vermiculite, night and day difference when it comes to mixing it with any kind of cement, and while it's true the agricultural stuff won't work, the aggregate works just fine. It really holds the heat in the fire path and insulates well enough that at 2" thick it is only about 200 degrees on the outside around the combustion critical portion of the stove.Ī number of people don't believe you can use vermiculite in this type of fabrication. I used the stainless needles for crack control and other than the two cracks mentioned, the stove has held up very well to about 50 or so very hot firings, hot enough to glow pink hot in the feed tube. I built a J tube from it and although it developed a couple of cracks from shrinkage in the beginning, they have not progressed or caused any problems. ![]() I don't have any experience with pre-mix refractory mortar, but vermiculite with Calcium Aluminate works pretty well. ![]()
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