An alumina mini proof-of-concept home-made kiln shelf (5 mm thick)

It is made from 96.5% calcined alumina (plus 3.5% Veegum to provide plasticity for forming). At cone 6, with no prior firing to a higher temperature, a 5mm thick slice can support a piece like this. Of course, prefiring to a higher temperature for extra hot strength is a better idea. A caution: This is just typical sintered alumina, it does not have nearly the thermal shock resistance that fully crystallized tabular alumina has.

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Materials	Calcined Alumina
Glossary	Refractory In the ceramic industry, refractory materials are those that can withstand a high temperature without deforming or melting. Refractories are used to build and furnish kilns.

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