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01302 Sigma-Aldrich

Fluosilicic acid

purum, 33.5-35%

Synonym: Fluorosilicic acid, Hexafluorosilicic acid, Hydrogen hexafluorosilicate

  • CAS Number 16961-83-4

  • Linear Formula H2SiF6

  • Molecular Weight 144.09

  •  MDL number MFCD00036289

  •  eCl@ss 38130308

  •  PubChem Substance ID 57646695

  •  NACRES NA.21

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Properties

Related Categories Acids, Acids & Bases, Chemical Synthesis, Inorganic Acids, Synthetic Reagents More...
InChI Key   ZEFWRWWINDLIIV-UHFFFAOYSA-N
Quality Level   200
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

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. Fluosilicic acid can be obtained as a major byproduct of phosphate fertilizer industry.It can be used in the preparation of sodium fluorosilicate, via neutralization with sodium chloride. It can also undergo neutralization with ammonia to produce ammonium fluoride and silica.

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.

Safety & Documentation

Safety Information

Symbol 
Signal word 
Danger
Hazard statements 
RIDADR 
UN 1778 8 / PGII
WGK Germany 
2

Documents

Certificate of Analysis (COA)

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