Sodium metasilicate pentahydrate is one of the main materials of super condensed laundry powder and used in dishware detergent,food industry detergent,metal detergent and waste paper deinking etc..So it has the bright foreground in daily use chemicals.This paper introduces the method of producing sodium metasilicate pentahydrate by glass water and sodium hydroxide via evaporation,cooling crystallization,centrifugal separation,and the optiumum conditions were determined,including the molar ratio of Na2O to S...