... detergent and metal cleaner.Instead of STPP.Sodium metasilicate anhydrous is strongly alkaline, having strong capacity of cleaning, ... for metal (zinc, aluminum, etc.). Therefore, sodium metasilicate anhydrous is widely used for the manufacture of a variety of ... maintenance agent, water retention agent, etc. Sodium metasilicate anhydrous is an inorganic white powder or crystalline granules, non-toxic ...