HMT-L028 Aluminum Welding Flux – Clean, Strong Joints on Aluminum
Aluminum is one of the hardest common metals to solder. Its surface forms an oxide film almost instantly, which blocks wetting and leaves you with weak, blobby joints. HMT-L028 Aluminum Welding Flux breaks down that oxide layer as you work, so the filler flows into the joint smoothly and bonds tightly to the base metal. Whether you are repairing a radiator, sealing an aluminum pipe, or fabricating thin aluminum parts, this flux helps you get a clean, professional result.
Why You'll Reach for It on Every Aluminum Job
Breaks through the oxide layer – actively removes and shields against aluminum's stubborn surface oxide, the number one cause of failed aluminum solder joints
Excellent wetting action – molten filler spreads and flows into the joint instead of balling up, for tight, gap-filling bonds
Stronger, cleaner joints – proper fluxing means less porosity and better adhesion between filler and base metal
Versatile on common aluminum work – well suited to radiators, condensers, pipes, tanks, window frames, castings, and thin aluminum sheet repairs
Easy removal – flux residue cleans away with water after the joint cools, leaving a tidy finish
How to Use
Clean the joint area thoroughly to remove oil, dirt, and old oxidation.
Apply an even coat of HMT-L028 flux to the surfaces to be joined.
Heat the workpiece evenly with your torch or soldering iron until the flux becomes active.
Feed the filler rod into the joint – it should flow freely and wet the aluminum.
Allow the joint to cool, then rinse off the flux residue with water and dry.
Specifications
Model: HMT-L028
Type: Aluminum welding/soldering flux
Applications: aluminum radiators, pipes, tanks, castings, sheet metal, and general aluminum brazing and soldering work
Who It's For
An essential consumable for auto radiator repair shops, air conditioning and refrigeration technicians, metal fabricators, and DIY repairers. Keep a container at the bench so you are always ready for aluminum jobs that ordinary flux simply cannot handle.
Tip: work with a clean surface and even heating – most weak aluminum joints come from skipped cleaning or overheated flux, not the filler itself.
