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01302

Sigma-Aldrich

Fluosilicic acid

purum, 33.5-35%

Synonym(s):

Fluorosilicic acid, Hexafluorosilicic acid, Hydrogen hexafluorosilicate

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About This Item

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

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 (PO43-): ≤1000 mg/kg
sulfate (SO42-): ≤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

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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.

pictograms

Skull and crossbonesCorrosion
GHS06,GHS05

signalword

Danger

Hazard Classifications

Acute Tox. 3 Dermal - Acute Tox. 4 Oral - Eye Dam. 1 - Skin Corr. 1

wgk_germany

WGK 2

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

Faceshields, Gloves, Goggles, type ABEK (EN14387) respirator filter

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Fluosilicic acid.
Journal of Chemical Education, 35(11), 562-562 (1958)
Elizabeth A Whitsitt et al.
Journal of colloid and interface science, 287(1), 318-325 (2005-05-26)
Liquid phase deposition (LPD) of silica from soluble silicates has been performed in the presence of dodecyltrimethylammonium bromide (DTAB), sodium dodecyl sulfate (SDS) and sodium dodecylbenzyl sulfate (SDBS). The morphology of the silica varies between semi-ordered uniform spheres to low
Myron J Coplan et al.
Neurotoxicology, 28(5), 1032-1042 (2007-04-11)
Silicofluorides (SiFs), fluosilicic acid (FSA) and sodium fluosilicate (NaFSA), are used to fluoridate over 90% of US fluoridated municipal water supplies. Living in communities with silicofluoride treated water (SiFW) is associated with two neurotoxic effects: (1) Prevalence of children with
"Recovery of high surface area mesoporous silica from waste hexafluorosilicic acid (H 2 SiF 6) of fertilizer industry"
Sarawade.BP, et al.
Journal of Hazardous Materials, 173(01), 576-580 (2010)
"Concentration and purification of fluosilicic acid by membrane distillation"
Tomaszewska.M
Industrial & Engineering Chemistry Research, 39(08), 3038-3041 (2000)
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