Sodium Silicate is a compound mixture of sodium oxide i.e. Na2o with silica sand i.e. Sio2 with water. Sodium silicate is also called water glass.There are two process to manufacture liquid Sodium Silicate. To manufacture a lower ratio of Sodium Silicate br Hydrothermal process. Mixture of Na2Co3 (Soda Ash) with Sio2 (Silica sand) in furnace fuses of more then 1100Ã‚Â° C gives sodium silicate glass in lumps form which is easily dissolved in hot water.