Fluosilicic acid
SIAL/01302 - purum, 33.5-35%
Synonym: Fluorosilicic acid; Hexafluorosilicic acid; Hydrogen hexafluorosilicate
CAS Number: 16961-83-4
Empirical Formula (Hill Notation): H2F6Si
Molecular Weight: 144.09
MDL Number: MFCD00036289
Linear Formula: H2SiF6
Product Type: Chemical
| anion traces | chloride (Cl-): ≤0.2% |
| phosphate (PO43-): ≤1000 mg/kg | |
| sulfate (SO42-): ≤0.2% | |
| cation traces | Fe: ≤100 mg/kg |
| concentration | 33.5-35% |
| density | 1.22 g/mL at 20 °C (lit.) |
| 1.31 g/mL at 25 °C | |
| grade | purum |
| impurities | ≤0.003% heavy metals (as Pb) |
| InChI | 1S/F4Si.2FH/c1-5(2,3)4;;/ |
| InChI key | ZEFWRWWINDLIIV-UHFFFAOYSA |
| Quality Level | 200  |
| SMILES string | F.F.F[Si](F)(F)F |
| Application: | Fluosilicic acid (FSA, H2SiF6) has been used in the following studies: • Fluoridation of fluoridated municipal water supplies. • Surface modification of calcium carbonate. • Liquid phase deposition (LPD) of silica. |
| 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. |
| Symbol |   GHS05,GHS07 |
| Signal word | Danger |
| Hazard statements | H302 + H312 - H314 |
| Precautionary statements | P270 - P280 - P301 + P312 - P303 + P361 + P353 - P304 + P340 + P310 - P305 + P351 + P338 |
| Hazard Codes | C |
| Risk Statements | 20/21/22-35 |
| Safety Statements | 26-36/37/39-45 |
| RIDADR | UN 1778 8 / PGII |
| WGK Germany | WGK 2 |
| Flash Point(F) | Not applicable |
| Flash Point(C) | Not applicable |
| Density | 1.22 g/mL at 20 °C (lit.); 1.31 g/mL at 25 °C |
| UNSPSC | 12352300 |