Agent Name

Potassium silicate

CAS Number




Major Category



Kasil; Kasil 6; PS 7; Potassium metasilicate; Potassium polysilicate; Potassium silicate solution; Potassium water glass; Pyramid 120; Silicic acid, potassium salt; Soluble potash glass; Soluble potash water glass; [ChemIDplus] Potassium salt of silicic acid; AgSil 25; Kasil 1; [Reference #2]


Metals, Inorganic Compounds


Colorless or yellowish hygroscopic solid; [Merck Index] White odorless powder; [Alfa Aesar MSDS]


Used as binder (carbon electrodes, lead pencils, protective coatings, insoluble pigments, and phosphors on television tubes), detergent additive, and catalyst; Also used to make glass, ceramics, welding rods, adhesives, cements, gels, and paints; [HSDB] Alkali metal silicates are used as starting materials for products like silicas and zeolites, in detergents and cleaners, and pulp and paper production; Also used to a lesser extent in soil stabilization and sealing, adhesives and binders (construction materials, paperboard and cardboard, ceramic binders, refractories, welding rods, and foundry molds and cores), surface coatings (titanium dioxide production, paints for masonry and glass, and spray coatings for tunnel construction and mining), water/wastewater treatment, enhanced oil recovery, and textile processing (bleach and dye stabilizing); [Reference #1] Used as a fungicide, miticide, and insecticide for use on agricultural crops, fruits, nuts, vines, turf, and ornamentals; [Reference #2]


Composition varying from K2-Si2-O5 to K2-Si3-O7 and may also contain water; [Merck Index] Skin and eye irritation ranges from non-irritating to corrosive, based on animal studies (as molar ratio SiO2:K2O decreases, irritation increases); Similar uses and adverse effects are expected from the hydrous and anhydrous forms of sodium and Potassium silicate (Sodium metasilicate pentahydrate, Sodium metasilicate nonahydrate, Sodium metasilicate, and Potassium silicate). [Reference #1] According to the FDA can be used interchangeably with sodium silicate, which is has GRAS status (Generally-Recognized as Safe); Corrosive to skin and eyes at concentrations above 80%; End-use product (29% aqueous solution) was not a skin sensitizer in guinea pigs; [Reference #2] Contains 0.1-1% crystalline silica; A skin and strong eye irritant; [Alfa Aesar MSDS]

Reference Link

OECD SIDS: Soluble Silicates - 2004

Adverse Effects

Skin Burns

Links to Other NLM Databases
Health Studies

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Toxicity Information


Chemical Information

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