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Other Names: Soluble glass, silicate of soda, liquid glass, water glass; similar to sodium metasilicate
Formula: Na2O.3.75 SiO2 to 2Na2O.SiO2 with various proportions of water
Viscosity: Varies widely over a range. Normal range is from 100 cPs. to 5,500 cPs. Normally handled at room temperature.
Sp. Gr.: 1.4 to 1.5
Remarks: White powder or clear liquid with widely varying viscosity. Freezing point is slightly lower than that of water. Made by melting sand and soda ash. Used as a catalyst. Also used in making soaps and detergents, adhesives, pigments, water treatment, bleaching and sizing of textiles and paper pulp, as a binder for foundry cores and molds and in waterproofing mortars and cements. Sodium silicate is irritating to the eyes and skin.
Pump Notes: Cast iron construction is satisfactory. Buna n elastomers are recommended. A mechanical shaft seal may be used if suitable for the viscosity and potential abrasion but packing is also frequently used.