Sodium Metasilicate or disodium silicate is colorless, transparent, glasslike substance available commercially as a powder or as a transparent, viscous solution in water.They can be dissolved in water to form a syrupy liquid. Some forms are slightly soluble, and some are almost insoluble; they are best dissolved by heating with water under pressure.The solutions are strongly alkaline.

They are produced chiefly by fusing sand and sodium carbonate in various proportions.

The use of Sodium Metasilicate is as a raw material for making silica gel. Also used as a detergent; as a cement for glass, pottery, and stoneware; for fireproofing paper, wood, cement, and other substances; for fixing pigments in paintings and cloth printing; and for preserving eggs.