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Building Industry Sodium Silicate Fluoride 188.06 Molecular Weight

Product Details

Place of Origin: CHINA

Brand Name: YIXIN

Certification: ISO9001

Model Number: YXF-005

Payment & Shipping Terms

Minimum Order Quantity: 1-25ton

Price: usd550-650/ton

Packaging Details: 50kg/bag

Delivery Time: 3-15days after received deposit

Supply Ability: 1000 ton per month

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sodium fluorosilicate


sodium hexafluorosilicate

Molcular Formula:
Other Name:
Sodium Hexafluorosilicate
Powder Or Granular
Molecular Weight:
Molcular Formula:
Other Name:
Sodium Hexafluorosilicate
Powder Or Granular
Molecular Weight:
Building Industry Sodium Silicate Fluoride 188.06 Molecular Weight

CAS NO 16893-85-9 Sodium Fluorosilicate powder use for building industry and glass making 




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.

Reference 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

% Fineness (through 250um sieve) 98.00

Appearance white powder



   Na2Si6                Item                 Specification
Na2SiF6 ≥99%
Fe ≤0.02%
Loss of Weight on drying at 105°C ≤0.40%
Insoluble in Water ≤0.50%
Free Acid(HCL) ≤0.15%
Heavy Metal(Pb) ≤0.05%




      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


well ventilated.

►Production method

     Calcium superphosphate byproduct method: use sulfuric acid and ground


phosphate rock for production of superphosphate or fluorine-containing waste gas


during extraction of phosphate with water absorbing silicon tetrafluoride to make it


into fluorosilicate. When the concentration of fluorine acid solution reaches 8% to


10%, stand static for clarification and remove the impurities with the clarified


fluorine silicate solution being added of sodium chloride (being excess of about


25%) for reaction of sodium fluorosilicate. Further go through centrifugation


isolation, washing, air drying at a temperature below 300 ℃ and then pulverize to


obtain the finished product of sodium fluorosilicate.

H2SiF6 + 2NaCl → Na2SiF6 + 2HCl

►Storage characteristics

Treasury: ventilation, low-temperature and drying; store it separately from food and




Sodium fluorosilicate can be used as:


1. The insecticide in agriculture.


2. Milky agent of enamel.


3 the corrosion production agent of opal glass


4. Wood preservatives and the raw material for the production of other kinds of


fluoride as well as being applied to the smelting of beryllium and aluminum and


pharmaceuticals, leather and rubber industry.


5. the refractory material, it can be used as the coagulant as the water glass binding


agent. Since sodium fluorosilicate has a low water solubility, it reaction with the


water glass is slow and gradual. This can not only boost the construction but also


has a high density and strength of the cured products.


6. It is most commonly used in the inorganic material binding with the water glass.

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