Sodium Silicate
Title: Sodium Silicate
CAS Registry Number: 1344-09-8
Additional Names: Water glass; soluble glass
Literature References: Manuf: Faith, Keyes & Clark's Industrial Chemicals, F. A. Lowenheim, M. K. Moran, Eds. (Wiley-Interscience, New York, 4th ed., 1975) pp 755-761.
Properties: The compositions of the commonly available sodium silicates in dry form are: Na2SiO3, Na6Si2O7, and Na2Si3O7, with variable amounts of water, the first-named containing approx 5H2O. They are in the form of colorless to white or grayish-white, crystal-like pieces or lumps. These silicates are very slightly sol or almost insol in cold water. They are best brought into soln by heating with water under pressure. They are less readily sol in large amounts of water than in small amounts of water, and the anhydr dissolve with more difficulty than the hydrated silicates; also, the silicates containing more sodium dissolve more readily. The aq solns are strongly alkaline. The dry sodium silicates are used relatively little. See also Sodium Metasilicate.
CAUTION: Irritating and caustic to skin, mucous membranes. If swallowed causes vomiting and diarrhea.
Use: Lining Bessemer converters, acid concentrators. Manuf grindstones, abrasive wheels (as binder only).

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