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FAQ/Answer

My witness cones are not bending. Besides underfiring, why would a witness cone fail to bend?

The cone must be slanted 8 degrees to bend accurately. Tightly packed sections of the kiln will fire cooler than loosely packed sections. If the elements are of the same resistance throughout the kiln, you will also find that the center of the kiln fires hotter than the top and bottom. For these reasons, some witness cones may not bend as far as other cones of the same number.

Orton reformulated some of their cones in 1996. Some cones made before 1996 do not bend at the same temperatures as today's cones.



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