meta Sodium metasilicate is a Inorganic compound with the chemical formula of Na2SiO3. It is a white particle, easily soluble in water, soluble in dilute sodium hydroxide solution, and insoluble in ethanol and acid. It is mainly used as an analytical reagent, fabric fire retardant, adhesive, hardener, weighting agent, filler, and also used for ore flotation and oil refining.