|Other Name:||Disodium Hexafluorosilicate||Odor:||Odorless|
|UN Number:||2674||CAS NO:||16893-85-9|
|Class Of Risk:||6.1||EINECS:||240-934-8|
99% salufer powder CAS NO 16893-85-9 can make cement additives in industry building and insecticide in agriculture
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
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%|
►Eference quality standards
105 ℃ Loss of weight upon drying% 0.17%
Sodium fluorosilicate (based on dry mass) 99.50
Free acid (calculated based on HCL) 0.0075
Water insoluble matter 0.12%
Heavy metals (Pb) content% <0.02
It appears as colorless hexagonal crystals. It is odorless and tasteless. It has
hygroscopicity. It can be dissolved in a solvent such as ethyl ether but insoluble in
alcohol with its solubility in acid is being greater than in the water.
1. Industry : additives in cement in building .
2. Agriculture : insecticide .
50kg /plastic bag ,or customized
Treasury: ventilation, low-temperature and drying; store it separately from food and
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