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