Ceramic Clay Firing Temperatures

Firing converts ceramic work from weak clay into a strong durable crystalline glasslike form.

Ceramic clay firing temperatures.

People want to know if they can fire a certain clay to a certain cone. Each ceramic glaze should be fired to a specific temperature range. It is bisque fired and then glaze fired. For success a potter must know the correct temperature range at which their glaze becomes mature.

You cannot fire pottery in a home oven because ovens do not get up to the high temperatures of more than 1 500 degrees fahrenheit that you need for firing clay. Stoneware glaze some decals fire to cone 10. The three most commonly used clay bodies are earthenware clay bodies mid fire stoneware clay bodies and high fire stoneware clay bodies. If fired at too low a temperature the glaze will not mature.

Firing clay from mud to ceramic. The temperature needed to transform soft clay into hard ceramic is extremely high and is usually provided by a kiln. Between the range of cone 8 and cone 12 high fire stoneware will mature. The average firing temperature for high fire stoneware is 2381 1305.

However anywhere from 2305 to 2336 1263 to 1326 may be appropriate depending on the specific clay used and desired effect. As a kiln is firing up and cooling down the changes in temperature make some profound changes in the clay. If the temperature goes too high the glaze will become too melted and run off the surface of the pottery. First it is important to know that the maximum cone rating of a stoneware or porcelain clay is the temperature at which it vitrifies.

This is the hardening tightening and finally the partial glassification of the clay. The clay goes from this soft totally fragile substance to one which is rock hard impervious to water wind and time. We get many questions about clay firing temperatures. The goal of bisque firing is to convert greenware to a durable semi vitrified porous stage where it can be safely handled during the glazing and decorating process.

Ware and glaze types. Generally bisque firing is done between cone 08 and cone 04 no matter what the maturation temperature of the clay and of the glazes that will be used later. By cone 08 the ware is sintered and has become a ceramic material.