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Physical properties Brand Mca-8a Mca-7a Index Mgo 83.44 85.64 Cao 8.05 7.59 Sio2 3.48 2.83 Cao/sio2 2.31 2.68 Refractoriness under load 1700 1680 Cold crushing strength 102 106 Thermal shock resistances 3 Apparent porosity 10 18