75014 - Lucas Milhaupt Ultra Flux Silver Brazing Paste - 7 oz Brush Cap

Achieve Perfect Brazing Joints with Ultra Flux

When it comes to silver brazing, preparation is everything, and Lucas Milhaupt Ultra Flux is the trusted partner for welders and HVAC technicians who demand reliability. This 7 oz jar of "white flux" is the industry standard for a reason: it's creamy, smooth, and stays exactly where you put it. Whether you are repairing copper lines in an HVAC system, fabricating custom stainless steel parts, or joining dissimilar metals, Ultra Flux ensures your filler metal flows smoothly and adheres deeply into the joint.

One of the biggest challenges in brazing is knowing when your base metal is hot enough. Ultra Flux helps you out by turning transparent when it reaches the working temperature (around 1100°F), giving you a clear visual cue to introduce your silver solder. This prevents overheating and ensures you don't waste expensive filler rod. The integrated brush cap is a massive time-saver, allowing you to apply the paste quickly and evenly without hunting for a separate acid brush. It works perfectly with most silver brazing alloys and protects your metal from oxidizing while you torch it.

Cleanup is often the worst part of the job, but not with this flux. Once your part has cooled, the glassy residue washes off easily with plain hot water and a rag or wire brush. No chipping, no grinding, and no nasty chemicals required. It’s safe for use on copper, brass, bronze, steel, and stainless steel, making it the only flux you need in your truck for 90% of your brazing jobs. Keep your joints clean and your workflow efficient with the proven performance of Lucas Milhaupt.