Cr2O3:46.0%min SiO2 :1.0%max FeO :26.5%max CaO :0.30%max MgO :10.0%max Al2O3:15.5%max P:0.003%max S:0.003%max Cr/Fe:1.55:1 Bulk Density:2.5-3 Color:Black PH:7-9 Percent soil:0.1%max Percent Moisture:0.1%max The sintered:1600?? Percentage of free acid present in the sand;0 filling density :2.6g/cm sintering point:1800°Cmin melting temperature:2180°C
