... metal cleaner.instead of STPP. Sodium metasilicate anhydrous is strongly alkaline, having strong capacity of cleaning ... pollution, preventing corrosion for metal (zinc, aluminum, etc.). Therefore, sodium metasilicate anhydrous is widely used for the manufacture ... maintenance agent, water retention agent, etc.PropertiesSodium metasilicate anhydrous is an inorganic white powder or crystalline granules, ...