Sodium silicate, also known as soda glass, is an inorganic substance with the chemical formula Na₂SiO₃. Its aqueous solution is called water glass, available in colorless, greenish, or brown solids or viscous liquids. It is widely used in foundry, papermaking, sand casting, mold making, paper tube and box adhesive, construction, carbon black, subway construction, gold and silver foil lamination, ceramics, alkali for silicate sol, and other applications. It can also be customized to create various liquid sodium silicate products according to customer requirements.