SODIUM METASILICATE. SYNONYMS Metso Beads, Silicic acid, disodium salt; Sodium-m-Silicate; Orthosil; Disodium metasilicate; Disodium Monosilicate; Waterglass; Disodium trioxosilicate CAS NO. 6834-92-0 (Anhydrous), 10213-79-3 (Pentahydrate), 13517-24-3 (Nonahydrate)"