... and chemical properties:Item indexItem IndexAppearanceWhite spherePore volume ,mL/g≥0.4Particle Size,mmΦ 5-7Surface area,m2/g≥250Crushing strength ... ,N/cm ≥100Na2O content,% ≤0.45Bulk density,kg/L0.60-0.70 Package: iron drum innerling plastic bags, net ...