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Description:Chemical composition: Specification of sodium base-bentonite Sio2:70+2% Al2o3:15.9 +1.5 % Fe2o3:2.3+0.1% Feo:0.95+0.1% Cao:0.96+0.1% Mgo:1.91+0.1% Nao:1.80+0.1% P2o3:0.04+0.01% Tio2:0.04+0.01% K2o:0.78+0.1% Caustic soda:0.55+0.1% Moisture:10% max Swelling index: Me/g more than or equal to 20 Ph value:9-10 Specification of calcium base-bentonite Sio2:68-72% Al2o3:13.5-16.5% Fe2o3: Lower than 1.9% Mgo:2.3-2.5% Cao:2.4-2.6% Tio2: Lower than 0.10% K2o:0.9-1.1% Na2o:0.3-0.5% L. O. I: Lower than 6.5% Size:70-320mesh Moisture:15% max Swelling index(mlg):8-12 Sand content:1%max Ph value:6.7-7.2