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01302

Fluosilicic acid

purum, 33.5-35%

Synonym(s):

Fluorosilicic acid, Hexafluorosilicic acid, Hydrogen hexafluorosilicate

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1 L

Estimated to ship onApril 27, 2026fromMILWAUKEE

$83.30
6 x 1 L

Estimated to ship onApril 27, 2026fromMILWAUKEE

$398.00
$298.50

About This Item

Linear Formula:
H2SiF6
CAS Number:
16961-83-4
Molecular Weight:
144.09
UNSPSC Code:
12352300
eCl@ss:
38130308
PubChem Substance ID:
57646695
NACRES:
NA.21
MDL number:
MFCD00036289
Concentration:
33.5-35%

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Estimated to ship onApril 27, 2026Details

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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

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.[1]
  • Surface modification of calcium carbonate.
  • Liquid phase deposition (LPD) of silica.[2]

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This Item
3727571.003121.00314
Fluosilicic acid purum, 33.5-35%

Sigma-Aldrich

01302

Fluosilicic acid

Fluorosilicic acid solution 20-25 wt. % in H2O

Sigma-Aldrich

372757

Fluorosilicic acid solution

Hydrochloric acid 25%, EMPROVE® ESSENTIAL, Ph. Helv.

SAFC

1.00312

Hydrochloric acid

Hydrochloric acid fuming, 37%, EMPROVE® ESSENTIAL, Ph. Eur., BP, JP, NF, ChP

SAFC

1.00314

Hydrochloric acid

grade

purum

grade

-

grade

-

grade

-

concentration

33.5-35%

concentration

20-25 wt. % in H2O

concentration

25%

concentration

37%

Quality Level

200

Quality Level

-

Quality Level

500

Quality Level

500

cation traces

Fe: ≤100 mg/kg

cation traces

-

cation traces

-

cation traces

-

density

1.22 g/mL at 20 °C (lit.), 1.31 g/mL at 25 °C

density

1.22 g/mL at 25 °C

density

1.12 g/cm3 at 20 °C, 1.18 g/mL at 20 °C

density

1.18 g/mL at 20 °C, 1.19 g/cm3 at 20 °C

anion traces

phosphate (PO43-): ≤1000 mg/kg, chloride (Cl-): ≤0.2%, sulfate (SO42-): ≤0.2%

anion traces

-

anion traces

-

anion traces

-

pictograms

Skull and crossbonesCorrosion
GHS06,GHS05

signalword

Danger

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

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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Certificates of Analysis (COA)

Lot/Batch Number
MKCJ6400
MKCD1518
MKCC1481
STBG6209
STBG6210

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High-silica fluosilicic acids: Specific reactions and the equilibrium with silica.
Thomsen SM.
Journal of the American Chemical Society, 74(7), 1690-1693 (1952)
"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)
Fluosilicic acid.
Journal of Chemical Education, 35(11), 562-562 (1958)
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Global Trade Item Number

SKUGTIN
01302-6X1L04061838608925
01302-1L04061838608918

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