Solder Flux Silver 250g

The Aluminum Brazing Flux is a specialized, active chemical compound engineered for the South African HVAC, automotive, and general engineering sectors. Specifically formulated to combat the rapid oxidation of aluminum, this 250g powder is the primary choice for technicians performing low-to-medium temperature brazing. It acts as a powerful deoxidizer, breaking down the tough alumina layer on the metal surface to allow for deep capillary action and a leak-proof bond between aluminum-to-aluminum or aluminum-to-copper components.

Key Performance Features

• Rapid Oxide Dissolution: Specifically engineered to dissolve the stubborn aluminum oxide layer at temperatures just below the melting point of the base metal.
• Superior Capillary Flow: Dramatically reduces the surface tension of the molten brazing alloy, ensuring it "pulls" deep into tight lap joints and T-junctions.
• Active Moisture-Resistance: Formulated to remain stable in the high-humidity environments often found in South African coastal workshops.
• Corrosion-Inhibiting Chemistry: While highly active during the heating phase, the flux is designed to be easily removed post-braze to prevent long-term pitting.

Ideal Applications

• HVAC & Refrigeration Repair: The industry standard for repairing aluminum evaporator coils, condensers, and connecting aluminum tubing in air conditioning systems.
• Automotive Radiator & AC Service: Ideal for patching leaks in aluminum radiators, intercoolers, and high-pressure aircon pipes.
• General Aluminum Fabrication: Used for joining aluminum sheet metal, cast components, and extruded sections in signage and light-marine industries.
• Electrical Component Joining: Effective for brazing aluminum busbars and specialized electrical connectors where a low-resistance joint is mandatory.

Product Benefits

• High-Purity 250g Container: Supplied in a moisture-sealed tub that is perfectly sized for professional toolboxes and onsite service kits.
• Versatile Application Method: The powder can be applied directly to a heated brazing rod ("hot-dipping") or mixed with a small amount of distilled water to create a targeted paste.
• Broad Temperature Range: Compatible with most high-silicon aluminum brazing alloys (such as 4047) with a working range typically between 550°C and 620°C.

Pro Tip: Aluminum brazing is a game of heat management. Unlike copper, aluminum does not change color before it melts. Apply the flux to the joint; when the flux turns clear and liquid, the base metal is at the correct temperature to accept the brazing rod. Always clean the joint thoroughly with a stainless steel wire brush (used only for aluminum) before applying flux to ensure a 100% airtight seal.