Ceramic glazes each have a temperature range that they should be fired to. If the glazes are fired at too low a temperature, the glaze will not mature. If the temperature goes too high, the glaze will become too melted and run off the surface of the pottery. For success, a potter must know their glazes' temperature ranges at which they become mature.
When potters talk about ceramic firing ranges, they are usually referring to the three most common: low-fire, mid-range, and high-fire ranges.... In regards to glazes, we need to add two other ranges: very low-fire, and lower mid-range firing ranges.
01 of 05
- from cone 022 (approx. 1112⁰F - 605⁰C)
- to cone 013 (approx. 1566⁰F - 850⁰C)
- Islamic Lustreware Origins and Techniques
02 of 05
- from cone 012 (approx. 1623⁰F - 882⁰C)
- to cone 02 (approx. 2048⁰F - 1120⁰C)
Low-fired ware can present some difficulties, including
- the clay body may remain overly porous
- low-fire glaze colors can appear rather harsh and... raw-looking
- the high percentage of flux or stronger-acting fluxes used can result in a softer, less durable glaze, and
- many of the traditional glaze materials used in this range are quite toxic in their raw state.
03 of 05
- from cone 01 (approx. 2079⁰F - 1110⁰C)
- to cone 3 (approx. 2134⁰F - 1145⁰C)
04 of 05
- from cone 4 (approx. 2167⁰F - 1165⁰C)
- to cone 7 (approx. 2264⁰F - 1210⁰C)
Other advantages to firing in the mid-range include
Continue to 5 of 5 below.
- ability to adjust and use stoneware clay bodies to this range
- in turn, mid-range stoneware bodies... increase the durability of the ware
- mid-range glazes are also more durable than those fired at lower temperatures, and
- there is still a fairly extensive color range available.
05 of 05
- from cone 8 (approx. 2305⁰F - 1260⁰C)
- to cone 14 (approx. 2530⁰F - 1390⁰C)