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2012-9-6 · Chemical Compatibility: Acid Base / Basic Neutral 3000 - Zirconia, Silica, Chrome - Magnesia, Lime (Calcium Oxide) - Alumina Silicon Carbide, Carbon, Graphite ZrO2 MgO CaO 2500 2000 °C 1500 1000 500 0 0 2 4 Cr2O3 Al2O3 SiO2 6 8 10 12 14 Acid 22 pH Base I.C