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Pyrometric cones large

These 2 inch high cones are for use inside the kiln firing chamber. Usually three cones are used, one for the intended firing temperature, one lower and one higher. Example: for a Cone 06 firing use Cone 07 as the guide cone (lower), Cone 06 as the firing cone and Cone 05 (higher) as the guard cone. Cones should be set in a cone plaque or holder, then placed inside the kiln in a location where they can be viewed through the peephole of the kiln. When the guide cone starts to bend it serves as a warning that the firing process is approaching completion. When the tip of the firing cone touches the plaque, the kiln is to be turned off. If the guard cone bends the ware has been overfired.

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