Sodium Hexafluoroaluminate (CAS 13775-53-6), commonly known as Cryolite, is a critical inorganic compound with significant industrial applications, most notably in the aluminum production sector. This white, crystalline powder serves as a vital flux, enabling the efficient electrolytic production of aluminum metal. Beyond this primary role, it also finds utility in the glass, ceramics, and even pesticide industries. For procurement managers and R&D scientists, a thorough understanding of its properties, handling, and sourcing is essential.

Understanding the Core Properties:

  • Chemical Identity: Sodium Hexafluoroaluminate, with the chemical formula Na3AlF6, has a molecular weight of approximately 209.94 g/mol. Its synonyms include Cryolite, Trisodium hexafluoroaluminate, and Aluminum sodium fluoride.
  • Physical Appearance: It typically presents as a white crystalline powder or solid.
  • Melting Point: The melting point is notably high, around 1000°C.
  • Solubility: It is sparingly soluble in water, with its aqueous solutions being slightly acidic.
  • Density: Its density is approximately 2.9 g/mL at 25°C.

Key Industrial Applications:

  • Aluminum Smelting: This is the most significant application. Cryolite acts as a molten solvent or flux for alumina (aluminum oxide) in the Hall-Héroult process. By lowering the melting point of alumina from over 2000°C to around 950-1000°C, it drastically reduces the energy required for aluminum extraction, making the process economically viable.
  • Glass and Ceramics: In these industries, Cryolite functions as a fluxing agent and an opacifier. It aids in lowering the melting temperatures of glass and ceramic formulations, promoting smoother finishes and achieving opacity in products like enamels and certain types of glass.
  • Pesticides: Historically, Cryolite has been used as an insecticide, particularly in agricultural applications for pest control on various crops.
  • Other Uses: It can also be found as a filler in resin-bonded grinding wheels and as a catalyst component in olefin polymerization.

Sourcing Considerations for Buyers:

When looking to buy Sodium Hexafluoroaluminate, it is critical to engage with reputable suppliers and manufacturers. Key considerations include:

  • Purity and Specifications: Verify that the product meets the required purity levels for your specific application. High-purity grades are often necessary for optimal performance in aluminum smelting. Ensure the supplier provides a detailed Certificate of Analysis (COA).
  • Supplier Reliability: Partner with manufacturers who have a proven track record and can guarantee consistent supply and quality. Understanding their production capacity and quality control measures is crucial.
  • Pricing: Obtain quotes from multiple suppliers to ensure competitive pricing. Factors like bulk order discounts, payment terms, and Incoterms will affect the final cost.
  • Safety and Handling: Always refer to the Safety Data Sheet (SDS) for proper handling, storage, and disposal procedures. While generally stable, appropriate precautions should be taken.

As a leading supplier of Sodium Hexafluoroaluminate, we are committed to providing high-quality products and reliable service to our B2B clients. We understand the critical nature of this chemical in your operations and strive to be your trusted partner. Contact us today to learn more about our offerings and to receive a quote for your requirements.