Product Brief‑ Sodium Silicofluoride
CAS No: 16893‑85‑9
EINECS: 240‑934‑8
Synonyms: Sodium Hexafluorosilicate, Sodium Fluorosilicate, Disodium Hexafluorosilicate
Molecular Formula: Na₂SiF₆
Molecular Weight: 188.06
Basic Information
Sodium silicofluoride is an inorganic fluorosilicate salt, white odourless crystalline powder. It decomposes at high temperature releasing silicon tetrafluoride gas. It is a basic industrial fluoride raw material, widely used in ceramics, glass, water‑treatment, building materials and fine‑fluorine‑chemical manufacturing.
Physico‑Chemical Properties
Appearance: White crystalline powder / granular solid, odourlessDensity (25 ℃): 2.68 g/cm³
Decomposition temperature: ＞300 ℃ (decompose into NaF + SiF₄ gas)
Solubility in water: 0.64‑0.76 g/100 mL (25 ℃); higher solubility in hot water; insoluble in ethanol
pH (50g/L slurry) 3.0‑4.0
Stability: Slightly hygroscopic; decomposes in strong alkali solution; avoid strong acid and high‑heat condition; non‑flammable
Quality Specification (Industrial Grade, HG/T 3252‑2017 Superior Grade)
| Test Items | Specification |
|---|---|
| Appearance | White crystalline powder |
| Na₂SiF₆ Assay | ≥99.0 % |
| Moisture | ≤0.30 % |
| Water‑insoluble matter | ≤0.10 % |
| Free acid (as HF) | ≤0.20 % |
Application & Uses
Ceramic & glass industry: Opacifier for glass; fluxing agent for ceramic/enamel glaze, improve surface gloss and acid‑resistance.
Building material: Setting agent for acid‑resistant cement and acid‑proof concrete.
Water‑treatment: Fluoridation additive for drinking‑water system.
Fluorochemical raw material: Manufacture of sodium fluoride, synthetic cryolite and other fluoride products.
Other fields: Wood preservative, latex coagulant, plating auxiliary, pesticide intermediate, plastic filler.
Packaging
‑ Standard export: 25 kg / 50 kg net, inner PE liner bag + outer PP woven bag.
‑ Bulk: 500‑1000 kg FIBC jumbo bag.
‑ Marking: Product name, CAS No., UN No., batch No., production date, gross/net weight, hazard label.
Storage & Transportation
‑ Hazard classification: UN 2674, Class 6.1 Toxic substance, Packing Group III；H301 Toxic if swallowed; H319 Causes serious eye irritation; H332 Harmful if inhaled.
‑ Transportation: Follow IMDG / IATA dangerous‑goods regulation. Keep packages intact, prevent dust leakage. Do not ship together with food, acids, alkalis and oxidants. Protect from rain and moisture.
‑ Storage: Store in cool, dry, well‑ventilated warehouse. Keep bags tightly sealed. Prevent moisture absorption. Separated storage from food‑stuff, acid, alkali and oxidizing agents.
‑ Recommended storage temperature: 10‑30 ℃.
‑ Shelf‑life: 12 months under original sealed packaging.‑ Handling reminder: Wear dust‑proof respirator, chemical‑resistant gloves and safety goggles; avoid dust inhalation, skin‑eye contact and ingestion.
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