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Mullite (3Al2O32SiO2) grains

  Sintered Mullite Fused Mullite
% Al2O3 68-72 ≥ 69
% SiO2 ≤ 24.5 ≤ 24
% Fe2O3 ≤ 0.75 ≤ 0.7
% CaO ≤ 0.15  
% MgO ≤ 0.1  
% TiO2 ≤ 1.7  
% Na2O+K2O ≤ 0.5  
% mullite phase 85-90 90
bulk density, g/cm3 2.85 2.90
% apparent porosity ≤ 3 ≤ 2
% water absorption ≤ 1  
size, mm 0-1, 3-5, 5-8 0-1, 3-5, 5-8