Question:
Are any two kilns are exactly alike?
Approx cone temps for bodies
Cone 022 10850F Lusters
018 1238 "
06 1840 Bisque, low fire glaze, raku
01 2030 Earthenware
1 2057 "
5 2156 Stoneware
10 2300 Stoneware, porcelain
12 2390 Porcelain
The numbers go higher and lower, but this is the range most commonly used.
Changes in firing
All clays and many minerals contain water which does not leave the body until above 700°F. Organic (carbon) materials need to be oxidized (burned out). Other minerals, such as calcite, break down and give off a carbon dioxide gas. Minierals such as flint (silica) undergo a sudden expansion on heating to 1060°F and contraction during cooling.
No two kilns are exactly alike
There is nothing mysterious about a kiln and you have no reason to be afraid of it. No two kilns are exactly alike, even if they are the same brand and model.
Levelling your kiln
Your floor may not be level but a kiln must be for proper firing. If necessary you can add shims under the legs of the stand to make it balance properly.
Using medium setting on electric kilns
The medium heat setting on your kiln will build-up the temperature in the kiln, but as it is an uneven heating, it should be used only for equalizing the temperature in a one switch kiln. In two switch kilns, use medium for building up the temperature gradually through the middle range, but always in a sequence that will keep the bottom of the kiln hotter than the top.
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| Guru Spotlight |
| Patricia Walters-Fischer |
