Chemical components: Chemical composition SiO2 Al2O3 K2O Fe2O3 CaO Na2O MgO H2O Contents(%) 47.32 33.25 11.82 1.81 0.03 0.96 0.91 2.7. Physical properties: Density (g/m3) Refractive index Whiteness (%) Moisture (%) Radius-thickness ratio Heat Resistance (¡ã C) L.O.I. (%) 2.80 1.60 70-80 60 1300 2.82-2.9.
