1) ISO 9001:2008 Certified company 2) Sodium Metasilicate Pentahydrate 3) SiO2 %: 27%min Sodium metasilicate pentahydrate is strongly alkaline, having strong capacity of cleaning, buffering and ... environmental pollution, preventing corrosion for metal (zinc, aluminum, etc.). Therefore, sodium metasilicate pentahydrate is widely used for the manufacture of a variety of ...