1) Molecular formula: Na2SiF6
2) Molecular weight: 188.06
3) Property:Sodium hexafluorosilicate is white powder, density is 2.75, has hygroscopicity, insoluble in alcohol, slightly soluble in water, decompose in alkali liquor, generate fluoride and silica, breakes down into sodium fluoride and silicon tetrafluoride if heated to 300οC or above.
4) Usage: Used as the opalizer of glass and enamel, wood preservative, insecticide agriculture, absorbent of acid proofing concrete, coagulant of acid proofing cement gum, fluoridation of drinking water, etc.
5) Technical index: Execute professional ZBG12017-89 standard
|
Chemical composition
|
Superior
|
First class
|
Qualified
|
| Appearance |
White crystal |
| Iron %≤ |
0.02 |
|
|
| 105οC Drying loss %≤ |
0.3 |
0.40 |
0.60 |
| Sodium hexafluorosilicate%≥ |
99.0 |
98.5 |
97.0 |
| Water insoluble matter %≤ |
0.4 |
0.50 |
1.00 |
| Free acid (Calculated by hydrofluoric acid)% ≤ |
0.1 |
0.15 |
0.20 |
| Content of heavy metal (Calculated by PB)% ≤ |
0.02 |
0.05 |
0.05 |
| Fineness (through 250 mesh) %≥ |
90 |
90 |
90 |
