Sodium Fluorosilicate CAS#16893-85-9
High Purity and Stable Crystal Form – Appears as white crystals or colorless hexagonal crystals with uniform structure, ensuring consistent quality and easy handling in industrial applications.
Good Chemical Reactivity – Easily decomposes in alkaline solutions and at high temperatures to form useful products such as sodium fluoride and silica, making it suitable as a reactive intermediate in chemical processing.
Excellent Moisture Absorption Ability – Possesses hygroscopic properties that enhance its performance in formulations requiring controlled moisture interaction.
Wide Solubility Compatibility – Shows good solubility in acids and selected solvents, providing flexibility for use in various chemical and industrial systems.
Products Description of Sodium fluorosilicate CAS#16893-85-9
Sodium fluorosilicate appears as white crystals, crystalline powder, or colorless hexagonal crystals. It is odorless and tasteless, with a relative density of 2.68 and hygroscopic properties. It is soluble in solvents such as ethyl ether but insoluble in alcohol, and its solubility in acids is higher than in water. In alkaline solutions, it decomposes to form sodium fluoride and silica. When heated to about 300 °C, it breaks down into sodium fluoride and silicon tetrafluoride.
Parameters
| Melting point | melts at red heat, decomposing [MER06] |
| Boiling point | 620℃[at 101 325 Pa] |
| density | 2.68 g/mL at 25 °C(lit.) |
| vapor pressure | 0.01Pa |
| refractive index | 1.31 |
| solubility | insoluble in ethanol |
| form | Crystals |
| color | White |
| Specific Gravity | 2.68 |
| Odor | odorless |
| Water Solubility | Slightly soluble in water. Solubility increases with temperature. Insoluble in alcoholSlightly soluble in water. Insoluble in alcohol. |
| Merck | 148,624 |
| Exposure limits | ACGIH: TWA 2.5 mg/m3 |
| NIOSH: IDLH 250 mg/m3; TWA 2.5 mg/m3 | |
| Stability: | Stable. Incompatible with oxidizing agents, water. Moisture sensitive. |
| LogP | 0.001 |
| CAS DataBase Reference | 16893-85-9(CAS DataBase Reference) |
| EPA Substance Registry System | Sodium fluosilicate (16893-85-9) |
Safety Information
| Hazard Codes | T,Xi |
| Risk Statements | 23/24/25 |
| Safety Statements | 26-45 |
| RIDADR | UN 2674 6.1/PG 3 |
| WGK Germany | 2 |
| RTECS | VV8410000 |
| Hazard Note | Irritant |
| TSCA | Yes |
| HazardClass | 6.1 |
| PackingGroup | III |
| HS Code | 2826908090 |
| Hazardous Substances Data | 16893-85-9(Hazardous Substances Data) |
| Toxicity | LD in rabbits (mg F/kg): 76 intragastric; in rats (mg F/kg): 42 s.c. (Muehlberger); LD in guinea pigs (mg/kg): 250 orally, 500 s.c. (Waldbott) |
Product Application of Sodium fluorosilicate CAS#16893-85-9
Sodium hexafluorosilicate is used as an additive for water fluoridation, as a raw material for opal glass, and in ore refining. It is also applied in the production of other fluoride chemicals such as sodium fluoride, sodium hexafluoroaluminate, potassium hexafluorosilicate, ammonium fluoride, and calcium fluoride. In addition, it is utilized as a flotation agent, a component for wet etching, a wood preservative, and as a brazing flux and welding compound. It also serves as an active ingredient in concrete.
