valutööstuses kordkasutusega liivvormide sideainena, betooni valmistamisel kõvendajana jms otstarbel kasutatav naatriumsilikaat Na2SiO3, silicate of sodium Na2SiO3 - a water-soluble glass used in viscous aqueous solutions as a binder in molding sand, deflocculant in ceramic bodies and glazes, a concrete hardener etc