Spinel is the group of minerals with the composition R0R2O3. It includes chromite and MgO. This material is based on MgO Al2O3. It has a higher melting point than pure corundum; alpha Al2O3. It is used in kiln furniture for firing pure alumina ceramics. There is no shrinkage; it expands and grows with progressive heat treatment at 1600°C.
Vibration cast with +9,5% water.
Development no. 25709