01302

Fluosilicic acid

purum, 33.5-35%

• Synonym(s): Fluorosilicic acid, Hexafluorosilicic acid, Hydrogen hexafluorosilicate
• Linear Formula: H₂SiF₆
• CAS Number: 16961-83-4
• Molecular Weight: 144.09
• MDL number: MFCD00036289
• UNSPSC Code: 12352300
• eCl@ss: 38130308
• PubChem Substance ID: 57646695
• NACRES: NA.21

Properties

• grade: purum
• Quality Level: 200
• concentration: 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 (PO₄^3-): ≤1000 mg/kg; sulfate (SO₄^2-): ≤0.2%
• cation traces: Fe: ≤100 mg/kg
• SMILES string: F.F.F[Si](F)(F)F
• InChI: 1S/F4Si.2FH/c1-5(2,3)4;;/h;2*1H
• InChI key: ZEFWRWWINDLIIV-UHFFFAOYSA-N

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 Information

• pictograms: GHS06,GHS05
• signalword: Danger
• hcodes: H302,H311,H314
• pcodes: P270 - P280 - P301 + P312 - P303 + P361 + P353 - P304 + P340 + P310 - P305 + P351 + P338
• Hazard Classifications: Acute Tox. 3 Dermal - Acute Tox. 4 Oral - Eye Dam. 1 - Skin Corr. 1
• Storage Class: 6.1D - Non-combustible acute toxic Cat.3 / toxic hazardous materials or hazardous materials causing chronic effects
• wgk_germany: WGK 2
• flash_point_f: Not applicable
• flash_point_c: Not applicable
• ppe: Faceshields, Gloves, Goggles, type ABEK (EN14387) respirator filter