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Specifications: SiO2: 65 : 65.5% Al2O: 16 : 18.56% TFe2O3: 0.2 : 0.5 % CaO: 0.3 : 0.5% Na2O: 2.0 : 5.0 % K2O: 6.0 : 11.95% Size: Powder: 0.1 – 0.5 mm Rock: 10mm