|Molcular Formula:||Na2SiF6||Other Name:||Sodium Hexafluorosilicate|
|Appearance:||Powder Or Granular||Molecular Weight:||188.06|
Uses of sodium silicate fluoride powder is make as insecticide and material of opal glass
|white granular powder|
|Solubility in water|| 0.64 g/100 mL (20 °C)
1.27 g/100 mL (50 °C)
2.45 g/100 mL (100 °C)
|insoluble in alcohol|
Refractive index (nD)
Lethal dose or concentration (LD, LC):
|LDLo (lowest published)||
70 mg/kg (mouse, oral)
Sodium fluorosilicate appears as white crystal, crystalline powder or colorless
hexagonal crystals. It is odorless and tasteless. Its relative density is 2.68;
it has moisture absorption capability. It can be dissolved in a solvent such as ethyl
ether but insoluble in alcohol. The solubility in acid is greater than that in water.
It can be decomposed in alkaline solution, generating sodium fluoride and silica.
After searing (300 ℃), it is decomposed into sodium fluoride and silicon
tetrafluoride. It is poisonous!
In 25 degrees, the sodium fluorosilicate has its water solubility being 0.78%.
Upon production, addition of an excess amount of sodium sulfate or sodium
chloride can increase the concentration of sodium ions in the system, thereby
increasing the solubility product of fluorine silicate and sodium ions, so that sodium
fluoride can be subject to more complete precipitation. Sodium fluorosilicate is the
byproduct in the production of calcium phosphate or the production of fluoride salt
in aluminum factory. It generally appears as a white crystalline powder with low
solubility in water (being 1% or less at room temperature), and the water solubility
increases slightly with increasing temperature. The aqueous solution of sodium
fluorosilicate is acidic (pH3). This is due to that its hydrolysis product contains
hydrofluoric acid. Reduction of the acidicity of the solution facilitates the hydrolysis
of sodium fluorosilicate. When pH is lower than 3.5-3.55, the hydrolysis reaction is
stabilized. When the pH is equal to 4, the hydrolysis reaction rate is significant.
When the pH value is equal to 8-8.5, the sodium fluorosilicate can be completely
hydrolyzed to exhibit as silica gel and precipitated out. Therefore, when sodium
fluorosilicate is added to the water glass, in addition to hardening effect of
precipitation of silicon dioxide gel caused by the neutralization of the sodium
hydroxide in the solution of water glass, the sodium fluorosilicate itself is also a
source of silica gel.
|Loss of Weight on drying at 105°C||≤0.40%|
|Insoluble in Water||≤0.50%|
This product is toxic with stimulation effect on the respiratory organ. People of
mistakenly oral poisoning will get severe symptoms of damage to the
gastrointestinal tract with the lethal dose being 0.4~4g. During the working of the
operator, they should wear the necessary protective equipment to prevent
poisoning. Production equipment should be sealed and the workshop should be
1. The insecticide in agriculture.
2. Opal glass
Treasury: ventilation, low-temperature and drying; store it separately from food and
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