Cone Chart – Temperatures

Pyrometric cones have been used to monitor ceramic firings for more than 100 years. They are useful in determining when a firing is complete, if the kiln provided enough heat, if there was a temperature difference in the kiln or if a problem occurred during the firing.
Cones are made from carefully controlled compositions. They bend in a repeatable manner (over a relatively small temperature range – usually less than 40° F). The final bending position is an indication of how much heat was absorbed.

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