This is made from Plainsman M340; it is a pottery clay used mainly for throwing on the wheel. Yet it proved to be no problem to dry this in the sun and fire it; no cracks appeared. This shape is amazingly stable; although this piece is fired to near vitrification (about 2% water absorption) it has stayed square. This was a test piece to prove the concept could be first-fired without failure; subsequent pieces were made using special clays, and the in-facing load-bearing corners were thickened and strengthened.
| Projects | Make a mold for 4-gallon stackable calciners |
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