FLUOROSILICIC ACID

PRODUCT IDENTIFICATION
CAS NO. 16961-83-4

FLUOROSILICIC ACID

EINECS NO. 241-034-8
FORMULA

 H2SiF6

MOL WT. 144.08

H.S.CODE

2811.19

TOXICITY  
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);

DERIVATION by-product of phosphate fertilizer or HF and silica

CLASSIFICATION

 

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

APPLICATIONS
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.
SALES SPECIFICATION

APPEARANCE

white to yellow solution
ASSAY (H2SiF6)

23.0% min

FLUORINE (F)

18.0% min

HEAVY METALS ( as Pb)

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)

REMARKS

-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.