Aluminum Hexafluorosilicate
Structural Formula Vector Image
Title: Aluminum Hexafluorosilicate
CAS Registry Number: 17099-70-6
Additional Names: Aluminum fluosilicate; aluminum silicofluoride
Molecular Formula: Al2F18Si3
Molecular Weight: 480.19
Percent Composition: Al 11.24%, F 71.22%, Si 17.55%
Line Formula: Al2(SiF6)3
Literature References: Occurs in nature as topaz, Al2SiO4(OH,F)2. Prepn: Sanfourche, Krapivine, Compt. Rend. 208, 2080 (1939).
Derivative Type: Nonahydrate
Properties: Hexagonal prisms. Easily sol in water; aq soln decomposes on heating or neutralization. Solid loses water on heating to temperatures below 500°, leaving a hexahydrate form; decomposes completely on heating to 1000°.
Use: Protection and preservation of construction materials; manuf of glass.

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