... making high efficiency detergent and metal cleaner.instead of STPP. Sodium metasilicate nonahydrate is strongly alkaline, having strong capacity of cleaning, buffering ... pollution, preventing corrosion for metal (zinc, aluminum, etc.). Therefore, sodium metasilicate nonahydrate is widely used for the manufacture of a variety of ... WhitenessLS-P80320-2319-23≤0.2 ≤0.05 ≥75 Sodium metasilicate nonahydrate