69080226 - All-State Strongset 509 Aluminum Soldering Flux 4oz

Professional Grade Aluminum Soldering Flux

The All-State Strongset 509 Flux by ESAB is a premium chemical agent designed to facilitate the soldering of aluminum and various dissimilar metals. Packaged in a convenient 4-ounce jar, this flux is an essential component for maintenance and repair professionals who frequently work with aluminum radiators, HVAC coils, and light-gauge fabrication. Its proprietary formula is engineered to break down tough aluminum oxides that typically prevent solder adhesion, ensuring a clean, metallic surface for the filler metal to bond with.

One of the standout features of the Strongset 509 Flux is its versatility. While it excels at joining aluminum to aluminum, it is equally effective when joining aluminum to copper, brass, steel, and even stainless steel. This makes it an invaluable tool in refrigeration repair where copper-to-aluminum transitions are common. The flux activates at a relatively low temperature range, which helps protect delicate base materials from overheating, warping, or melting—a common risk when working with thin-walled aluminum components.

Using this flux is straightforward. It can be applied with a brush directly to the joint area. As the metal is heated, the flux transforms, indicating the proper temperature for adding the solder alloy. It is specifically formulated to work in tandem with the All-State Strongset 509 solder rod, creating a system that delivers tensile strengths often exceeding the base metal itself. After the soldering process is complete, the remaining flux residues can be easily washed away with warm water, preventing long-term corrosion and ensuring a professional finish.

Whether you are repairing a leak in an automotive condenser or fabricating a custom aluminum assembly, the Strongset 509 Flux provides the chemical cleaning action necessary for a leak-proof, durable bond. Its consistency allows it to stay in place during application, and its powerful wetting action draws the solder deep into the joint for maximum structural integrity.