Potassium silicate

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Potassium silicate
Ball and stick model of polymeric potassium silicate
Preferred IUPAC name
Potassium metasilicate
Other names
Liquid glass
1312-76-1 N
ChemSpider 59585 YesY
EC number 233-001-1
Jmol-3D images Image
PubChem 66200
Molar mass 154.28 g·mol−1
Appearance White crystals
EU classification Corrosive (C), Irritant (Xi)
R-phrases R34, R37
S-phrases (S1/2), S13, S24/25, S36/37/39, S45
NFPA 704
Flammability code 0: Will not burn. E.g., water Health code 1: Exposure would cause irritation but only minor residual injury. E.g., turpentine Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
Related compounds
Other anions
Potassium carbonate
Potassium germanate
Potassium stannate
Potassium plumbate
Other cations
Sodium silicate
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 N verify (what isYesY/N?)
Infobox references

Potassium silicate is a water-soluble and glass-forming silicate salt of general formula K2SiO3 with many common uses for at least a century.


it can be synthesized in the laboratory by reacting Potassium Hydroxide with Silicon Dioxide with stirring at 90 °C following this Reaction

n SiO2 + 2 KOH → K2O•nSiO2 + H2O


Woodwork protection against fire[edit]

Impregnation of wood with a potassium silicate solution is an easy and low cost way for rendering the woodwork of houses secure against catching fire. The woodwork is first saturated with a diluted and nearly neutral solution of potash silicate. After drying, one or two coats of a more concentrated solution are usually applied.[1]


In horticulture, potassium silicate is used as a soluble source of potassium and silicon. It makes the growing medium more alkaline.

Industrial uses[edit]

Some metal cleaning formulations use potassium silicate, which also serves as a corrosion inhibitor.[2] It also finds various uses in the fabrication of welding rods or even of cosmetics.

See also[edit]


External links[edit]