Re: cheap excellent material for oven walls
A few months ago I picked up a stainless steel food warmer with internal dimensions of roughly 4'w x 2'd x 5'h. On its own it would heat to 200F. Concerned about whether the foam insulation in the 2" walls would handle PC temps I plucked a chunk out, stuck it in an oven, and progressively heated. At 400+ it charred so I began trying to find something cheap to buffer the heat flow into the insulation a bit.
Before finding this forum I bought some 1/2" hardibacker to line the cabinet so I was glad to find this thread. Then with other info I found here I calculated that the 2 2600W elements I had should be ample to bring up to temp. What I'm finding though is that the hardibacker is releasing a lot of moisture as steam and I can't get temp much above 200F.
This stuff apparently holds a lot of moisture. At our local Lowes its stored outside and gets rained on frequently. Hopefully it will eventually dry out. Anyway, if you're looking at using it for an interior lining though - you might want to store in dry place for a while before mounting and firing up.
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