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What are the different types of potassium fluoroaluminate?

2026-03-11

Classification by Chemical Structure

Potassium Tetrafluoroaluminate (KAlF₄)

CAS No.: 14484-69-6, also known as monopotassium fluoroaluminate.
Appearance: white / light gray powder
Melting point: approximately 560℃
Main applications: aluminum brazing flux, fluxing agent for ceramics and glass.

Potassium Hexafluoroaluminate (K₃AlF₆)

Also known as potassium cryolite.
CAS No.: 13775-52-5
Appearance: white crystalline powder
Melting point: higher (approx. 1020℃)
Main applications: aluminum electrolysis, resin grinding wheels, high‑end ceramic glazes.

Intermediate Compounds (e.g., K₂AlF₅)

Rare in industrial production; mostly formed as intermediate phases during reactions.

Classification by Industrial Purity & Application Grade

Industrial Grade (Purity: 95%–98%)

Low cost; available as white powder or gray granules.
Used for general aluminum welding, ceramic fluxing, and abrasive filling.

High‑Purity Grade (Purity ≥99.5%)

Extremely low impurities (Fe, Si, Pb, etc.).
Used in electronic ceramics, optical glass, and special alloy manufacturing.

Specialized Grades

Brazing‑grade fluoroaluminate: uniform particle size (200–325 mesh), stable fluxing activity.
Aluminum electrolysis‑grade potassium cryolite: low moisture, low sulfate, suitable for electrolytic cells.
Ceramic glaze grade: controlled fluorine volatilization, improved gloss and corrosion resistance.

Classification by Physical Form

Powder: 20, 40, 100, 200, 325 mesh
Granular: 1–3 mm, suitable for automatic feeding and dust reduction
Fused lump: for direct use in large‑scale electrolysis plants

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