Size: 1-3mm,3-5mm,20-40mesh, 40-60mesh, 60-80mesh, 100mesh, 200mesh, 325-1250mesh, or accoring to customers'?? requirements.?1.Chemical property:? ChemicalCompositionSiO2Al2O3K2ONa2OMgOFe2O3TiO2S+PCaO??NameSilicon dioxideAluminiumtrioxidePotassium oxideSodium oxideMagnesium?oxideIron?trioxideLilaniumdioxideSulphur+calciumCalciumoxide??Content(%)44.529.110.571.170.654.210.7-1.20.02-0.050.57??2. Physical Properties:? Proportion(kg/m3)Index of refractionBrightnessMoistureSandThicknessHeat ResistanceLoss in heatingPHOil absorptivityVickers hardness??7501.645°-75°less than 1%0.4-2%60More than1000°C2.8-3%7.0-8.048-500/100g2.5-4?