Brazing Flux Aluminium 50g

The 50g Aluminium Brazing Flux is a high-activity chemical agent specifically engineered for the South African HVAC, automotive, and light engineering sectors. Formulated as a fine, moisture-sensitive powder, it is the primary choice for technicians using aluminium-silicon brazing rods to join various grades of aluminium and its alloys. This flux is absolutely critical because aluminium forms a tough, transparent oxide layer almost instantly; this flux is designed to chemically dissolve that layer at low temperatures, allowing the molten brazing alloy to "wet" and flow into the joint for a high-strength, leak-proof bond.

Key Performance Features

• Aggressive Oxide-Dissolving Formula: Specifically targeted to break down the resilient Al₂O₃ oxide layer, ensuring the brazing alloy bonds at a molecular level with the parent metal.
• Low-Temperature Activity Range: Optimized for use between 450°C and 600°C, perfectly matching the melting points of standard 4047 and 12% Silicon aluminium brazing rods.
• High-Purity Chemical Base: Manufactured to provide a clean, dross-free flow that minimizes porosity in the finished joint, essential for pressurized systems.
• Versatile Application: Can be used by dipping a heated rod into the powder or by mixing it with a small amount of distilled water to create a localized paste for precision capillary work.

Ideal Applications

• Automotive Radiator & AC Repair: The industry standard for repairing cracked aluminium radiator tanks, condenser cores, and intercooler piping.
• HVAC & Refrigeration: Perfect for joining thin-walled aluminium tubing in modern high-efficiency cooling coils and heat exchangers.
• Light Marine & Boating Maintenance: Ideal for repairing aluminium hulls, boat fittings, and outboard motor housings where a high-strength joint is required.
• DIY & Prototyping: A reliable choice for building aluminium furniture frames, security screens, and custom light-gauge structural projects.

Product Benefits

• Ensures Leak-Proof Joints: By promoting superior capillary action, this flux ensures the brazing alloy fills the entire joint, which is mandatory for fluid and gas-tight applications.
• Prevents Parent Metal Melting: The flux begins its cleaning action well before the aluminium reaches its melting point, allowing the operator to flow the rod safely without "blowing holes" in the workpiece.
• Compact 50g Service Size: The ideal volume for mobile technician toolboxes and service bakkies, ensuring the powder remains fresh and dry in a sealed environment.

Pro Tip: Aluminium does not change colour when heated (it doesn't turn red). Use this flux as your temperature indicator: when the powder melts and becomes a clear, watery liquid on the workpiece, the metal has reached the correct temperature to apply your brazing rod. Safety & Maintenance: Post-braze cleaning is mandatory. This flux is corrosive once heated; always wash the joint thoroughly with warm water and a stainless steel brush after it has cooled to prevent long-term surface pitting.