... effective detergents and rust remover for metal, reducing environmental po Sodium metasilicate pentahydrate is strongly alkaline, having strong capacity of cleaning, buffering ... pollution, preventing corrosion for metal (zinc, aluminum, etc.). Therefore, sodium metasilicate pentahydrate is widely used for the manufacture of a variety of ... .5-3027.3-29.2≤0.2≤0.05≥75 sodium metasilicate pentahydrate