Properties
Grog is composed of: 40% minimum alumina, 30% minimum silica, 4% maximum Iron(III) oxide, 2% maximum of calcium oxide and magnesium oxide combined.
Its melting point is approximately 1,780 °C (3,240 °F). Its water absorption is 7% maximum. Its thermal expansion coefficient is 5.2 mm/m and thermal conductivity is 0.8 W/(m·K) at 100°C and 1,0 W/(m·K) at 1000°C. It is also not easily wetted by steel.
Read more about this topic: Grog (clay)
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