Fluorosilicic acid solution , AR,30.0-32.0% , 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. |
| InChI | 1S/F4Si.2FH/c1-5(2,3)4;;/h;2*1H |
| InChIKey | AUJBMDCSBIPDEH-UHFFFAOYSA-N |
| SMILES | F.F.F[Si](F)(F)F |
| CAS DataBase Reference | 16961-83-4(CAS DataBase Reference) |
| EPA Substance Registry System | Fluosilicic acid (16961-83-4) |
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 1-2% solution is used widely for sterilizing equipment in brewing and bottling establishments. Other concentrations are used in the electrolytic refining of lead, in electroplating, for hardening cement, crumbling lime or brick work, for the removal of lime from hides during the tanning process, to remove molds, as preservative for timber.
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 |
| PPE | Faceshields, Gloves, Goggles, type ABEK (EN14387) respirator filter |
| 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 | TSCA listed |
| HazardClass | 8 |
| PackingGroup | II |
| HS Code | 28111990 |
| Storage Class | 6.1D - Non-combustible acute toxic Cat.3 toxic hazardous materials or hazardous materials causing chronic effects |
| Hazard Classifications | Acute Tox. 3 Dermal Acute Tox. 4 Oral Eye Dam. 1 Skin Corr. 1 |
| Hazardous Substances Data | 16961-83-4(Hazardous Substances Data) |
| Toxicity | LD50 oral in rat: 430mg/kg |
