FLUOROSILICIC ACID

PRODUCT IDENTIFICATION

CAS NO. 16961-83-4; 1309-45-1; 12672-67-2

FLUOROSILICIC ACID

EINECS NO. 241-034-8
FORMULA

 H2SiF6

MOL WT. 144.08

H.S.CODE

2811.19.6090
TOXICITY Rat LD50 (Oral): 430mg/kg
SYNONYMS

Hydrofluorosilicic Acid; Hydrosilicofluoric acid;

Sand acid; Silicofluoric acid; Fluosilicic acid; Hydrofluorosilicic acid; Hydrofluosilic Acid; Hexafluorosilicic acid; Dihydrogen hexafluorosilicate; 氟硅酸; Hexafluorokieselsäure (Dutch); ácido hexafluorosilicico (Spanish); Acide hexafluorosilicique (French); Silicofluoric acid; Silicofluoride; Silicon hexafluoride dihydride; Fluorosilicic acid; H2SiF6; Hydrogen hexafluorosilicate;

SMILES by-product of phosphate fertilizer or HF and silica

SMILES

[F-][Si+4]([F-])([F-])([F-])([F-])[F-]

CLASSIFICATION

Hydrogen compound, Fluoride, Silicate, Acid, Coordination compound

PHYSICAL AND CHEMICAL PROPERTIES

PHYSICAL STATE white to yellow solution
MELTING POINT -15.5 C
BOILING POINT 105 C
SPECIFIC GRAVITY 1.46 (60%), 1.28 ( 30%)
SOLUBILITY IN WATER Complete
pH 1.2 (1% Sol.)
VAPOR DENSITY  

AUTOIGNITION

 

NFPA RATINGS

 

REFRACTIVE INDEX

 

FLASH POINT

 

STABILITY Stable under ordinary conditions

GENERAL DESCRIPTION & EXTERNAL LINKS

Water fluoridation, Wood preservative, Sterilization of equipment, Electroplating, Tanning, Glass etching, Cement Hardening, Oil acidizing, Rust Removal in textile field, lead refining and fluorosilicate salt manufacture.

Wikipedia Linking:http://en.wikipedia.org/wiki/Hexafluorosilicic_acid

http://www.fluoridealert.org/
The major use of sodium hexafluorosilicate and fluorosilicic acid is as fluoridation agents for drinking water. Sodium hexafluorosilicate has also been used for caries control as part of a silicophosphate cement, an acidic gel in combination with monocalcium phosphate monohydrate, and a two-solution fluoride mouth rinse. Both chemicals are also used as a chemical intermediate (raw material) for aluminum trifluoride, cryolite (Na3AlF6), silicon tetrafluoride, and other fluorosilicates and have found applications in commercial laundry. Other applications for sodium hexafluorosilicate include its use in enamels/enamel frits for china and porcelain, in opalescent glass, metallurgy (aluminum and beryllium), glue, ore flotation, leather and wood preservatives, and in insecticides and rodenticides. It has been used in the manufacture of pure silicon, as a gelling agent in the production of molded latex foam, and as a fluorinating agent in organic synthesis to convert organodichlorophosphorus compounds to the corresponding organodifluorophosphorus compound. In veterinary practice, external application of sodium hexafluorosilicate combats lice and mosquitoes on cattle, sheep, swine, and poultry, and oral administration combats roundworms and possibly whipworms in swine and prevents dental caries in rats. Apparently, all pesticidal products had their registrations cancelled or they were discontinued by the early 1990s. Fluorosilicic acid is used in the tanning of animal hides and skins, in ceramics and glass, in technical paints, in oil well acidizing, in the manufacture of hydrogen fluoride, for the sterilization of equipment (e.g., in brewing and bottling establishments and for copper and brass vehicles), and in electroplating. It is also employed as an impregnating ingredient to preserve wood and harden masonry and for the removal of mold as well as rust and stain in textiles.

http://www.cdc.gov/niosh/ipcsneng/neng1233.html
International Chemical Safety Cards

http://www.solvaychemicals.us/
Acid Characteristics: Fluorosilicic acid is a transparent, straw colored, corrosive liquid having the chemical formulation of H2SiF6. It is manufactured in modern rubber lined equipment producingan acid of high commercial purity. Commercial water solutions of the acid are available, having concentration of between 20% and 25% H2SiF6. Fluorosilicic acid is generally believed not to exist in the vapor phase, but only in solution. Upon vaporizing, it decomposes into hydrofluoric acid (HF) and silicon tetrafluoride. This equilibrium exists at the surface of strong solutions of fluorosilicic acid and if stored in glass containers, the small concentration of hydrofluoric acid may very slowly attack the glass above the solution level. For this reason, it is generally shipped in polyethylene containers rather than glass carboys. A 23% fluorosilicic acid water solution weighs 10.2 pounds per gallon at 60ºF, and has a fluoride (F) content of 17.41%.

SALES SPECIFICATION

APPEARANCE

white to yellow solution
ASSAY (H2SiF6)

23.0% min

FLUORINE (F)

18.0% min

HEAVY METALS

20ppm max

HYDROFLUORIC ACID (HF)

1.0% max

VISCOSITY

6.5 cps

TRANSPORTATION
PACKING 25kgs in plastic drum
HAZARD CLASS 8 (Corrosive)
UN NO.

1778 (Packing group: II)

OTHER INFORMATION

-Fluorosilicic Acid is available generally as a 20 to 40 percent aqueous solution.
-
60-70% solution will be solidified at 19 C to form a dihydrate crystalline.

PRICES