ItemIndex Cr2O346.0% SiO21.0% FeO26.5% CaO0.30% MgO10.0% Al2O315.5% P0.003% S0.003% Cr/Fe1.55:1 Bulk Density2.5-3 ColorBlack PH7-9 The amount of the acid 2 ML Percent soil0.1% Percent Moisture0.1% The sintered1600 Percentage of free acid present in the sand0 filling density2.6g/cm³ sintering point> 1800°C melting temperature2180°C Regular size AFS 25-35 AFS25-30 AFS30-35 AFS35-40 AFS40-45 AFS45-50 AFS50-55 AFS55-60 AFS60-65