Home Shop Lucas Milhaupt Ultra Flux Silver Brazing Paste – 7 oz Brush Cap
Awaiting product image

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

Packaging: 24 per case
$18.00/ea

Package Price:

$432.00/24 per case

Usually ships within 3-5 business days

SKU: LUC75014 Categories: ,

OVERVIEW

Technical Overview of Lucas Milhaupt Ultra Flux

Lucas Milhaupt Ultra Flux is a premium general-purpose silver brazing flux formulated to meet the rigorous demands of industrial joining applications. Designated under the AWS A5.31 classification as Type FB3-A and conforming to AMS 3410 specifications, this flux is engineered for the brazing of ferrous and non-ferrous base metals. The chemical composition consists of a balanced mixture of potassium salts of fluorine and boron, suspended in a water-based paste carrier. This formulation ensures stability and consistent performance across a wide active temperature range of 1100°F to 1600°F (593°C to 871°C).

Thermodynamically, Ultra Flux is designed to dissolve surface oxides effectively within its active window, promoting superior wetting and capillary action of the filler metal. It provides a protective barrier against oxidation during the heating cycle, which is critical for maintaining joint integrity in metals such as steel, stainless steel, copper, copper alloys, and nickel alloys. The flux transitions from a white paste to a clear liquid as it reaches brazing temperature, serving as a visual temperature indicator for the operator. Post-process, the residual flux is completely water-soluble, allowing for removal with hot water (approx. 140°F/60°C), thereby eliminating the need for harsh chemical post-cleaning agents. This product is not recommended for aluminum, magnesium, or titanium brazing applications.

The 75014 SKU is packaged in a 7 oz jar featuring an integrated brush cap, facilitating precise application directly to the joint area without external tools. This packaging design minimizes contamination risks and ensures the paste remains homogenous during storage.

Additional Information
Packaging Description:1 per each, 24 per case
Brand:Lucas Milhaupt
Item:Neutral Paste
Flux Type:Silver Brazing Paste
Temperature Range:1100°F - 1600°F (593°C - 871°C)
AWS Classification:AWS A5.31 Type FB3-A
Net Weight:7 oz
Container Type:Brush Cap Jar
Applications:Ferrous alloys, Non-Ferrous Alloys, Silver Brazing

INCLUDED

  • 1x 7 oz Jar of Ultra Flux with Brush Cap

APPLICATIONS

  • HVAC/R copper pipe joining
  • Stainless steel fabrication
  • General maintenance and repair (MRO)
  • Automotive tube assemblies
  • Jewelry and metal art
  • Dissimilar metal joining (e.g., copper to steel)

FAQ

Lucas Milhaupt Ultra Flux is active between 1100°F and 1600°F (593°C - 871°C).

No, Ultra Flux is designed for ferrous and non-ferrous metals like steel, stainless steel, copper, and brass. It is not suitable for aluminum, magnesium, or titanium.

The residue is water-soluble. It can be removed easily using hot water (around 140°F) and a rag or stiff brush.

It meets AWS A5.31 Type FB3-A and AMS 3410 specifications.

Yes, the 7 oz jar (SKU 75014) includes a brush cap for convenient application.

If the paste becomes too thick or dries out, it can be reconstituted by mixing in a small amount of clean water until it returns to a creamy consistency.

While the flux cleans up with water, the suitability for food grade depends on the brazing alloy used and thorough post-braze cleaning. Always consult local codes and the SDS.

When stored properly with the lid tightly closed at room temperature, it has a shelf life of approximately one year, though it often lasts longer if rehydrated.

Related products