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Rc-a(ball clay) Sio2 : 52.5% Al2o3 : 30.5% Fe2o3 : 2.58% Cao : 0.11% Mgo : 0.41% K2o : 2.19% Na2o : 0.37% Tio2 : 0.58% Dried mor(kgf/cm2) : 68.42 Residue on 325mesh sieve(%) : 0.4 Moisture : 18%~20% 1mt per bag