Item MC-10A MC-10B MC-10C MC-14A MC-14B MC-14C MC-18A MC-18B MC-18C MgO/% = 80 78 76 76 74 74 72 70 70 C/% = 10 10 10 14 14 14 18 18 18 Apparent porosity/% = 4 5 6 4 5 6 3 4 5 Bulk density/g.cm3 = 2.9 2.85 2.8 2.9 2.82 2.77 2.9 2.8 2.77 Cold crushing strength/ Mpa = 40 35 30 40 35 25 40 35 25 Modulus of rupture/Mpa = 6 5 4 10 8 5 9 7 4