Chemicla Formula:Na2O·Al2O3·2SiO2·4.5H2O SPECIFICATION: Calcium exhanging ability(mgCaCO3/g): 315 Min. Whiteness(%) :97 Min. PH(1% solution,25oC): 10.8 Max. LOI(800oC,1 H)(%): 21 Max. Al 3+ (dry basis)(%) : 18 Min. Al2O3(%) :28 SiO2(%) : 33 Na2O(%) :33