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Kaolin and Silica mixed material Particle Size (typical) : < 0.6mm Unfired Brightness : 83 Composition (typical) LOI (1,000o C) : 8% SiO2 : 54% Al2O3 : 33% Fe2O3 : 1.5% K20 : 2.4% MgO : 0.5% TiO2 : 0.3% CaO : 0.01% Theoretical Mica/ Illite : 20%