Although the manufacturer states these shelves will fire to a higher temperature,
We do not recommend the 13mm shelves be fired above 1220°C. Under careful oxidising conditions, the heavier 19mm shelves will withstand temperatures of 1300°C.
We would warn against using these shelves in heavy reduction atmospheres.
Cordulite Kiln shelves made from a mix of talc, clay, alumina, and silica
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