Sodium Silicofluoride   Specification:
[Formula]: Na2SiF6
[Molecular Weight]:  188. 06
[Execute Standard]: HG/T3252-2000
[UN-NO: 2674 / Hazardous Class: 6. 1]
[H. S. CODE: 2826. 2000]
[Sodium fluorosilicate (based on dry) ]:  99% min
[Iron (Fe) ]: 0. 02% max
[Free acid (based on HCI) ]:   0. 1% max
[Heavy metal (based on Pb) ]: 0. 02% max
[Water-insoluble matter]: 0. 4% max
[Loss on Drying at 105' C]: 0. 3% max
[Grain size passing through a 250 um Mash screen]: 90% min
 

It is used as antiseptic in  timber  industry,  hygroscopic agent of acid-resisting concrete, solidifying agent in natural latex products, additive in plating with zinc, nickel, iron and filler in plastic and  fluorinating agent in   pharmaceuticals and drinking water. It is used to produce insecticide in pesticide industry and sodium fluoride in man-made cryolite.