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01302 Sigma-Aldrich

Fluosilicic acid

purum, 33.5-35%

Synonym: Fluorosilicic acid, Hexafluorosilicic acid, Hydrogen hexafluorosilicate

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Properties

Related Categories Acids, Acids & Bases, Chemical Synthesis, Inorganic Acids, Synthetic Reagents More...
InChI Key   ZEFWRWWINDLIIV-UHFFFAOYSA-N
grade   purum
assay   33.5-35%
impurities   ≤0.003% heavy metals (as Pb)
density   1.22 g/mL at 20 °C(lit.)
  1.31 g/mL at 25 °C
anion traces   chloride (Cl-): ≤0.2%
  phosphate (PO43-): ≤1000 mg/kg
  sulfate (SO42-): ≤0.2%
cation traces   Fe: ≤100 mg/kg

Description

Application

Fluosilicic acid (FSA, H2SiF6) has been used in the following studies:
• Fluoridation of fluoridated municipal water supplies.
• Surface modification of calcium carbonate.
• Liquid phase deposition (LPD) of silica.

General description

High-silic fluoro silicic acids have been prepared. They have desired amount of extra silica upto 18% more than the composition as represented by H2SiF6. Preparation and properties of fluosilicic acid have been reported.

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UN 1778 8 / PGII
WGK Germany 
2
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