Sodium fluorosilicate

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Sodium fluorosilicate
CAS number 16893-85-9 YesY
PubChem 28127
ChemSpider 26165 YesY
EC number 240-934-8
UN number 2674
RTECS number VV8410000
Jmol-3D images Image 1
Molecular formula F6Na2Si
Molar mass 188.06 g mol−1
Appearance white granular powder
Odor odorless
Density 2.7 g/cm3
Solubility in water 0.64 g/100 mL (20 °C)
1.27 g/100 mL (50 °C)
2.45 g/100 mL (100 °C)
Solubility insoluble in alcohol
Refractive index (nD) 1.312
Crystal structure hexagonal
NFPA 704
Flammability code 0: Will not burn. E.g., water Health code 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g., chloroform Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
Related compounds
Other cations Ammonium hexafluorosilicate

Fluorosilicic acid

Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Sodium fluorosilicate is a compound with formula Na2SiF6.


Sodium fluorosilicate is made by neutralizing fluorosilicic acid with sodium chloride or sodium sulfate.

Possible Application[edit]

It is used in some countries as additives for water fluoridation, opal glass raw material, ore refining, or other fluoride chemical (like sodium fluoride, magnesium silicofluoride, cryolite, aluminum fluoride) production.[2]

See also[edit]


  1. ^ "Parent Hydride Names and Substitutive Nomenclature". Nomenclature of Inorganic Chemistry, IUPAC Recommendations 2005 (PDF). RSC Publishing. 2005. pp. 114–135. 
  2. ^