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Shanghai Yixin Chemical Co., Ltd.
Shanghai Yixin Chemical Co., Ltd.
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Man Made Cryolite Powder , Pure UN Number 2674 Sodium Hexafluorosilicate

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

Payment Terms: L/C, T/T, Western Union,

Supply Ability: 1000 ton per month

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sodium fluorosilicate


sodium hexafluorosilicate

Other Name:
Powder Or Granular
Molecular Weight:
RTECS Number:
UN Number:
Other Name:
Powder Or Granular
Molecular Weight:
RTECS Number:
UN Number:
Man Made Cryolite Powder , Pure UN Number 2674 Sodium Hexafluorosilicate

Man-made cryolite powder sodium hexafluorosilicate UN number 2674 can use for wood preservation and insecticide



  Sodium fluorosilicate appears as white crystal, crystalline powder or colorless


hexagonal crystals.It has many features . 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.


   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%

►Reactivity Profile

     Sodium fluorosilicate has weak oxidizing or reducing powers. Redox reactions


can however still occur. The majority of compounds in this class are slightly soluble


or insoluble in water. If soluble in water, then the solutions are usually neither


strongly acidic nor strongly basic. These compounds are not water-reactive.

►Health Hazard


     Inhalation of dust may irritate nose and throat. Ingestion causes symptoms


similar to fluoride poisoning; compound is highly toxic; initial symptoms include


nausea, cramps, vomiting, diarrhea, and dehydration; in severe cases, convulsions,


shock, and cyanosis are followed by death in 2-4 hr. Contact with eyes causes


irritation. Contact with skin causes rash, redness, and burning, sometimes followed


by ulcer formation.

►Storage characteristics

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






1. The insecticide in agriculture.


2. Wood preservatives 


3. Man-made cryolite

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