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Sodium fluorosilicate is a Fine, white, odorless, powdered solid .And it is
madeby neutralizing fluorosilicic acid with sodium chloride or sodium
sulfate.It is odorless and tasteless.Its relative density is 2.68;It has moisture
absorption capability.It can be dissolved in a solvent such as ethyl ether but
insoluble in alcohol.The solubility in acid is greater than that in water.It can be
decomposed in alkaline solution, generating sodium fluoride and silica. After
searing (300 ℃), it is decomposed into sodium fluoride and silicon tetrafluoride. It is
poisonous!
Properties
| |||
Chemical formula
| Na2[SiF6] | ||
Molar mass
| 188 g/mol | ||
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 | ||
Structure | |||
Crystal structure | hexagonal | ||
Hazards | |||
Lethal dose or concentration (LD, LC): | |||
| LDLo (lowest published) | 70 mg/kg (mouse, oral)
| ||
Related compounds | |||
| Other cations | Ammonium hexafluorosilicate Fluorosilicic acid | ||
| |||
| HAZARD CLASS | 6.1 | ||
| Na2Si6 | Item | Specification |
| Na2SiF6 | ≥99% | |
| Fe | ≤0.02% | |
| Loss of Weight on drying at 105°C | ≤0.40% | |
| Insoluble in Water | ≤0.50% | |
| Free Acid(HCL) | ≤0.15% | |
| Heavy Metal(Pb) | ≤0.05% |
It appears as colorless hexagonal crystals. It is odorless and tasteless. It has
hygroscopicity. It can be dissolved in a solvent such as ethyl ether but insoluble in
alcohol with its solubility in acid is being greater than in the water.
105 ℃ Loss of weight upon drying% 0.17%
Sodium fluorosilicate (based on dry mass) 99.50
Free acid (calculated based on HCL) 0.0075
Water insoluble matter 0.12%
Heavy metals (Pb) content% <0.02
• Insecticide in agriculture
• Additives in cements in building industry
• opal glass
• ore flotation
• water fluoridation
• other fluoride chemical (like sodium fluoride, magnesium silicofluoride, cryolite,
aluminum fluoride)
• productionin the field of laundry souring
• manufacturing enamels
• manufacturing coated papers
• wood preservative
• foam production
1-20 ton
