Burning the clay requires a high temperature

The firing of the "bare" clay after modeling and shaping is called raw firing. Similar to the possibly occurring glaze firing, a final temperature of at least 800 degrees Celsius is required. Material thickness and size of the workpiece additionally influence the temperature and the time required.

Ovens can only bake clay

Even if the temperature has to be right when firing clay, the time factor is equally important. The heating and cooling must be slow and, as the final actual burning time, the maximum temperature must be supplied in the exact holding time. A well-ventilated oven improves the burn rate.

If the maximum temperature of at least 800 degrees of the oven is not reached, it can only speak of a baking of the sound. Since conventional ovens can usually only heat up to 300 degrees, clay baking is only possible at home when buying a kiln.

Sequence of the raw firing of clay in temperature and time steps

  • Heating from start to about 100 degrees per hour to 650 degrees
  • Continue heating at about 150 degrees per hour from the final temperature
  • Final temperature depends on material thickness and composition 800 to 1200 degrees
  • Holding time in the maximum temperature 15 to 20 minutes
  • Rule of thumb for cooling the closed oven after switching off is about one hour per hundred degrees

If you use an oven without temperature display, you should get an external thermometer. It can not only measure the degree of cooling, but also draws attention to any deviations from the specified settings.

Tips & Tricks

The glazing of clay requires similar temperatures to the raw firing. Pay close attention here to the fact that too high temperatures do not harden the glaze and allow it to "clog".

Video Board: Testing Clay in a BBQ