Description Percentage of 64.8 ⤠Fe ⤠65.22 FeO Max 13 MgO Max 2 ± 0.54 S Max 0.015 P Max 0.16 SiO2 Max 3.5 ± 0.57 Al2O3 Max 18 CaO Max 1.5 ± 0.59 CCS Min 25010 T Index Min 9011 A Index Max 3.512 Porosity Ave 24%0-8 mm Max 2%8-16 mm Min 93%Ë16 mm Max 5%