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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 5°C). The final bending position is an indication of how much heat was absorbed. More detail at the Orton website>
IMPORTANT! Do not confuse cone numbers with a 0 (zero) with those without. Cones prefixed with a 0 (zero) are for low temperature firings, cones without are for high temperature firings.
FAQ: How do I use Orton Pyrometric Cones?
Download our Temperature Equivalent Chart in °C for Orton Pyrometric Cones
