In form of fine crushed alloy (0.2:0.7) mm diameter Chemical analysis: wt. % Si 70-80% Mn 0.70% max Al 0.75-1.25 P 0.05% max S 0.05% max Ca 0.75-1.25% RE 2.0% max Physical properties: Grain Size: 0.2mm : 0.7mm Melting temperature: 1200℃ Max Fused alumina-or high alumina fire-clay