POTTERS TIP: Stop things sticking with Alumina Calcined
Want to stop that lid sticking during your final glaze firing or your porcelain pots from sticking to the kiln shelves?
Here is a little tip. Sprinkling Alumina Calcined on the unglazed surface between the two pieces or on the kiln shelve will help.
Additionally, when used as a direct source of alumina in glazes, alumina has the effect of increasing glaze viscosity and firing range and resistance to crystallization. The crawling tendency of glazes with high clay content is reduced by introducing alumina as part replacement for clay.
A melting point of 2050C also makes alumina useful in batt washes, etc.
Alumina Calcined 100 Mesh is not expensive can be purchased from your local ceramics supplier.