Potassium silicate

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Colorless, amorphous material with a variable composition from K2Si2O5 to K2Si3O7. Potassium silicate is used as an ingredient in Potash glass. Potash water glass is also used to made carbon electrodes, lead pencils, detergents, and protective coatings.

Synonyms and Related Terms

liquid silicate; potash water glass; soluble potash glass


Physical and Chemical Properties

Soluble in hot water. Insoluble in ethanol.

Composition K2SiO3
CAS 1312-76-2
Refractive Index 1.532, 1.660, 1.730

Resources and Citations

  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 738
  • Ralph Mayer, A Dictionary of Art Terms and Techniques, Harper and Row Publishers, New York, 1969 (also 1945 printing)
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 7838
  • CRC Handbook of Chemistry and Physics, Robert Weast (ed.), CRC Press, Boca Raton, Florida, v. 61, 1980 Comment: ref. index=1.532, 1.660, 1.730

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