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Calcined Kaolin sand and powder for foundry casting application 1. About the Kaolin : Kaolin specification: SiO 2 % Al 2 O 3 % Fe 2 O 3 % TiO 2 % CaO% MgO% K 2 O% Na 2 O% MnO% 52±2 45±2 ≤0.5 ≤1.5 <0.5 ...