Sodium Hexafluorosilicate, Sodium Silicofluoride, Disodium Hexafluorosilicate, Sodium Fluosilicate, Sodium Silicon Fluoride, Sodium Fluorosilicate, 16893-85-9

Sodium Hexafluorosilicate, Sodium Silicofluoride, Disodium Hexafluorosilicate, Sodium Fluosilicate, Sodium Silicon Fluoride, Sodium Fluorosilicate, 16893-85-9

SODIUM HEXAFLUOROSILICATE (SODIUM SILICOFLUORIDE)

PRODUCT IDENTIFIER INFORMATION

CHEMICAL STRUCTURE

        F⁻      F⁻
         \      /
          Si  F
         /      \
        F⁻      F⁻
          \    /
           Na⁺  Na⁺
           
    Sodium Hexafluorosilicate (Na₂SiF₆)
    Ionic Structure with Octahedral [SiF₆]²⁻ Complex

Sodium Hexafluorosilicate Molecular Structure

Molecular Formula: Na₂SiF₆
SMILES: [Na+].[Na+].FSi-2(F)(F)(F)F
InChI: 1S/F6Si.2Na/c1-7(2,3,4,5)6;;/q-2;2*+1
Crystal System: Hexagonal (trigonal)

SECTION 1: CHEMICAL IDENTITY AND DESCRIPTION

SECTION 2: PHYSICAL AND CHEMICAL PROPERTIES

SECTION 3: CHEMICAL PROPERTIES AND REACTIVITY

SECTION 4: PRODUCTION METHOD

Raw Materials:

• Fluorosilicic Acid (H₂SiF₆) - main raw material

• Neutralization agents:

  • Sodium Hydroxide (NaOH - liquid caustic soda)

  • Sodium Carbonate (Na₂CO₃)

  • Alternative: Sodium Chloride (NaCl)

Reactions:

With Sodium Hydroxide:

H₂SiF₆ + 2NaOH → Na₂SiF₆ + 2H₂O

With Sodium Carbonate:

H₂SiF₆ + Na₂CO₃ → Na₂SiF₆ + H₂O + CO₂

With Sodium Chloride:

H₂SiF₆ + 2NaCl → Na₂SiF₆ + 2HCl

Process Notes:

• The ratios of reactive materials must be continuously controlled

• Stoichiometric balance is critical to prevent excessive fluoride formation

• The product is crystallized, filtered, washed, and dried

• Purity can be improved by recrystallization

SECTION 5: FUNCTIONAL PROPERTIES AND MECHANISM OF ACTION

SECTION 6: MAIN APPLICATION AREAS

SECTION 7: QUALITY SPECIFICATIONS (TECHNICAL GRADE)

SECTION 8: TOXICOLOGICAL PROFILE

SECTION 9: GHS CLASSIFICATION AND LABELING

GHS Classification (according to 1272/2008/EC and UN GHS):

Signal Word: DANGER

Hazard Pictograms: GHS06 (Skull and Crossbones), GHS05 (Corrosion), GHS07 (Exclamation Mark), GHS09 (Environment)

Hazard Statements (H-Codes):

NFPA 704 Hazard Classification:

SECTION 10: PRECAUTIONARY STATEMENTS (P-CODES)

SECTION 11: FIRST AID MEASURES

SECTION 12: FIRE-FIGHTING MEASURES

SECTION 13: STORAGE AND SHELF LIFE

SECTION 14: PACKAGING OPTIONS

SECTION 15: TRANSPORT INFORMATION

SECTION 16: REGULATORY STATUS

SECTION 17: OTHER NAMES AND SYNONYMS

SECTION 18: INDUSTRY APPLICATION FORMULATIONS

SECTION 19: ALTERNATIVES COMPARISON TABLE

Alternative Summary:

SECTION 20: SUMMARY TABLE

SECTION 21: CRITICAL WARNINGS AND BEST PRACTICES

CRITICAL WARNINGS:

• Toxic if swallowed (H301). Fluoride compounds are highly toxic.

• Causes serious eye damage (H318). Wear full eye and face protection.

• Causes skin irritation (H315). Use chemical-resistant gloves.

• May cause respiratory irritation (H335). Use adequate ventilation and respiratory protection.

• Causes damage to organs through prolonged exposure (H372). Monitor exposure levels.

• Harmful to aquatic life with long-lasting effects (H412). Prevent environmental release.

• Hazardous decomposition products: Heating releases toxic hydrogen fluoride (HF) and silicon tetrafluoride (SiF₄) gases.

• Reacts with acids to release toxic HF gas. Never mix with acids.

• Incompatibilities: Keep away from strong acids, strong bases, oxidizing agents, aluminum powder, magnesium powder, and organic materials.

• Moisture-sensitive: Reacts with moisture to release HF; store in dry conditions.

BEST PRACTICE RECOMMENDATIONS:

• Metallurgy: Use as raw material for beryllium production and alloying; handle with care at high temperatures; ensure proper ventilation.

• Glass and Ceramic Industry: Use as opacifier in glazes and frits; typical usage 0.2-0.8%; ensure homogeneous distribution for consistent results.

• Refractory Materials: Use as coagulant in water glass binder systems; provides high density and strength in cured products; dosage must be carefully controlled.

• Construction Materials: Use as setting agent and moisture absorbent in acid-resistant cement; typical addition 0.5-1.0%; avoid excessive dosage to prevent cracking.

• Water Treatment: Use for drinking water fluoridation at 10-25 mg/L; strictly follow WHO and local regulations; monitor fluoride levels continuously.

• Metal Surface Treatment: Use 2-5 g/L solution for anti-corrosion coatings; apply by immersion method; PPE is mandatory as acidic environment releases fluorides.

• Handling: Use in well-ventilated areas or under fume hood; wear chemical-resistant gloves, safety goggles, face shield, and appropriate respiratory protection; avoid creating dust.

• Storage: Store in tightly closed, properly labeled containers in dry conditions; keep away from heat, acids, and incompatible materials; protect from moisture.

• Spill Response: Avoid creating dust; wear full PPE; vacuum or wet sweep; place in sealed containers for disposal; do not use combustible absorbents; use vermiculite or other inert absorbents.

• Disposal: Dispose of in accordance with local, regional, and national regulations; do not discharge into drains or water bodies; fluoride compounds are regulated as hazardous waste.

LEGAL DISCLAIMER:

The information provided in this document is based on our current knowledge and experience and is presented in good faith. However, as all conditions of use are beyond our control, it does not constitute a binding specification or warranty. This Technical Data Sheet is for informational purposes only. Users are responsible for testing the suitability of the product for their specific applications. For complete safety, storage, use, handling, waste, and regulatory compliance information, please refer to the official Safety Data Sheet (SDS/MSDS) provided by the manufacturer/supplier.