Fluorosilicic acid solution , 33.0-40.0% , 16961-83-4
Synonym(s):
Hexafluorosilicic acid;Fluorosilicic acid;Hydrogen hexafluorosilicate;Adrenocorticotropic hormone fragment 1-39;Corticotropin A
CAS NO.：16961-83-4
Empirical Formula: F6H2Si
Molecular Weight: 144.09
MDL number: MFCD00145721
EINECS: 241-034-8
PRODUCT Properties
| Boiling point: | 108-109°C |
| Density | 1.22 g/mL at 20 °C (lit.)
1.31 g/mL at 25 °C |
| vapor pressure | 23hPa at 19.85℃ |
| refractive index | 1.3500 |
| Flash point: | 108-109°C |
| storage temp. | −20°C |
| solubility | H2O: 1 mg/mL, clear, colorless |
| pka | 1.83[at 20 ℃] |
| form | Liquid |
| color | Clear colorless |
| Specific Gravity | 1.38 (40%) |
| Water Solubility | Miscible with water. |
| Hydrolytic Sensitivity | 0: forms stable aqueous solutions |
| Merck | 14,4182 |
| Exposure limits | ACGIH: TWA 2.5 mg/m3 NIOSH: IDLH 250 mg/m3; TWA 2.5 mg/m3 |
| Stability: | Stable in aqueous solution. |
| InChIKey | AUJBMDCSBIPDEH-UHFFFAOYSA-N |
Description and Uses
Hexafluorosilicic acid is a kind of inorganic acid. It is majorly used for the fluoridation of water in United State to minimize the incidence of dental caries and dental fluorosis. For chemical synthesis, it is majorly used for the manufacturing of aluminum fluoride and cryolite as well as many kinds of hexafluorosilicate salts. It can also be used for the production of silicon and silicon dioxide. It can also be used as an electrolyte in the Betts electrolytic process for refining lead. It is also a specialized reagent in organic synthesis for cleaving Si–O bonds of silyl ethers.
A fluoride source with both protic and Lewis acid properties providing efficient cleavage of silicon–oxygen bonds, e.g. silyl ether deprotection.
Safety
| Symbol(GHS) |   GHS05,GHS06 |
| Signal word | Danger |
| Hazard statements | H302-H311-H314 |
| Precautionary statements | P270-P280-P301+P312-P303+P361+P353-P304+P340+P310-P305+P351+P338 |
| Hazard Codes | C |
| Risk Statements | 34-35-20/21/22 |
| Safety Statements | 26-36/37/39-45-27 |
| RIDADR | UN 1778 8/PG 2 |
| WGK Germany | 3 |
| RTECS | VV8225000 |
| F | 8-10 |
| Hazard Note | Corrosive |
| TSCA | Yes |
| HazardClass | 8 |
| PackingGroup | II |
| HS Code | 28111990 |
| Toxicity | LD50 oral in rat: 430mg/kg |
