Alumina (Al2O3) is our secondary glass former in ceramic glazes.  It has a very high melting temperature 2200°C. That’s 900°C over cone 10.

Alumina acts as a glaze stiffener.  It helps to keep our glazes from running off the pot.

We source Alumina from the clay mineral which is made up of Alumina (Al2O3), Silica (SiO2) and chemically bound water (H2O). The generic formula for the clay mineral is Al2O3•2SiO2•2H2O

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