S 0658 (OTTO) Sodium metasilicate, pentahydrate, ≥95% Cas 6834-92-0 - used as a starting material for zeolites and silica catalysts. It acts as an adhesive and binder, corrosion inhibitor, penetrating sealant, coagulant in waste water treatment, fixative for hand dyeing with reactive dye and detergent auxiliaries.