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FAQ/Answer

Why does a gap form on the left and right curved ends of the lid on my oval kiln?

A firebrick lid does not remain flat at high temperatures. The inner lid surface expands more than the outer surface, resulting in what we at the factory call "oil canning." Since the inner lid surface expands more than the outer, the lid bows downward toward the firing chamber. The outer surface becomes very slightly concave, and the inner surface becomes convex. The change in shape is not enough to notice except around the edges of the lid, where you will see a line of light.

The change in shape is more pronounced on the oval kiln than it is on the "round" 10- or 12-sided kilns. The oval lid bows upward about 1/4" from the kiln body on the left and right side. When the lid cools down again, it flattens out. This is nothing to be concerned about.



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