Sodium Fluorosilicate CAS#16893-85-9
Hygroscopic: Absorbs moisture from the air, enhancing its reactivity in certain conditions.
Acidic Solubility: Solubility increases in acidic environments, making it useful in various applications.
Thermal Decomposition: Decomposes at high temperatures to produce sodium fluoride and silicon tetrafluoride gas.
Stable at Room Temperature: Remains stable under normal conditions, though sensitive to moisture and oxidizing agents.
Sodium fluorosilicate appears as a white crystalline powder or colorless hexagonal crystals. It is both odorless and tasteless, with a relative density of approximately 2.68. This compound is hygroscopic, meaning it can absorb moisture from the air. It is soluble in certain solvents like ethyl ether but remains insoluble in alcohol. Its solubility increases in acidic environments compared to water. In alkaline solutions, it decomposes into sodium fluoride and silica. When heated to around 300 °C, it undergoes thermal decomposition, yielding sodium fluoride and silicon tetrafluoride gas.
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 | 1.310 |
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 | 14,8624 |
Exposure limits | ACGIH: 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) |
