Pyrometric cones 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 firing. Cones are made from carefully controlled compositions and they bend in a repeatable manner (over a relatively small temperature range- less than 40ºF).

Firing Temperatures:

747°C – Lusters, Over Glazes & Transfers

999°C – Bisque, Over Glazes & Hardening

1060°C – Earthenware Glazes (Colours)

11101°C – Earthenware Glazes (Transparent)

1222°C – Doll Slip (Pink & White)

1263°C – Stoneware Glazes

1280°C – Porcelain