... and white carbon black.Low price and good quality. Usage: In the industries of paper, soap, detergent, construction materials, delicate casting ... -46.039.0-41.050.0-52.0Sodium oxide (Na2O),% >7.08.210.29.512.8Silicon dioxide (SiO2),% > 24.626.025 ... -3.73.1-3.42.6-2.92.2-2.52.2-2.5Fe ,% <0.02Insolubles In water,% <0.2 Water glass(Sodium ...