... , pulp and paper, elastomers, disinfection agents, coatings, agriculture. Sodium Metasilicate Pentahydrate SYNONYMS: Metso Beads, Silicic acid, disodium salt; Sodium-m-Silicate ... Insoluble:0.2% MAXWHITENESS:80MIN.PH:12-13 Sodium Metasilicate Pentahydrate