Formula: Na2SiF6
Molecular: 188.06
Execute standard: National standard/GB 23936-2009
Executive: White crystalline powder,odorless, relative density: 2.679 g/cm3, hygroscopic.Soluble in ether, insoluble in alcohol. Decomposed in alkaline solution, forming NAF AND SiO2. In the searing heat(abpve 300℃），it is broken down into NaF and SiO4;toxic.
AWWA/NSF/UL Grade Portable Water Treatment

Chemical Analysis	Typical	Chemical Analysis	Typical
Assay (Na2SiF6)	≥98.5%	Water Insoluble Matter	≤0.5%
Fluorine(F)	≥59.43%	Heavy Metals,as Lead (Pb)	50ppm Max
Moisture as H2O	≤0.5%

Specific impurity limits in milligrams per kilogram of Na2SiF6

Impurity	Limit-mg/kg	Impurity	Limit-mg/kg
Antomy	990	Mercury	346
Arsenic	495	Molybenum	3,465
Cadmium	198	Nickel	3,960
Chromium	2,475	Selenium	495
Lead	495

Physical Properties
Description: Dry crystalline non-hygroscopic salt, meeting AWWA StandardB-702,and the NSF/ANSI Standard 60 for Fluoride Fluorosiicate.
Specification Gravity (H2O=1): 2.679
Boiling Proint: Decomposes at 500 ℃ (932 。F)
Molecular Weight: 188.05
Solubility in Water: 0.76 grams/100 ml of water @ 25℃
2.45 grams/100 ml of water @ 100 ℃
Guaranteed Screens: ≥89% through 40 mesh
≤25% through 325 mesh
Ph (1% Solution): 3.0-4.5