Brazing in HVAC/R

HVAC Brazing, How to braze copper HVAC, HVAC Solder or Braze, Sil-Fos

Next-Generation Brazing for HVAC/R

Lucas Milhaupt has been a trusted partner to the HVAC/R industry for decades, providing specialized brazing alloys and expertise that ensure durable, leak-free joints in refrigeration and air conditioning equipment . Our legacy began with the invention of Sil-Fos® – a silver-copper-phosphorus brazing alloy patented in 1931 – which allows flux-free brazing of copper connections and remains a staple for HVAC/R contractors . Today, as HVAC/R systems evolve with trends like a transition from copper to aluminum components and the adoption of new refrigerants under stricter efficiency standards , Lucas Milhaupt continues to innovate with next-generation products. We offer advanced flux-cored alloys (such as AL822 for aluminum-to-aluminum or aluminum-to-copper repair brazing ) and provide industry-specific training and support. OEMs, service technicians, and distributors alike rely on our comprehensive solutions and technical expertise to meet the demanding needs of modern HVAC/R systems, while maintaining strong, hermetic joints that withstand the pressure and thermal cycling of operation .

What’s Your Challenge?

sil-fos, silver brazing, brazing in hvac/r

Designing robust brazing processes for HVAC/R OEM's

Trust our team of brazing experts to help you improve robust processes on your production line. Learn about the cutting-edge joining solutions our engineers have designed to help OEMs stay competitive in today’s market.

HVAC/R OEM's

sil fos, lucas milhault sil-fos, sil-fos products

Providing superior brazing products for distribution

Lucas Milhaupt partners with HVAC/R and plumbing distributors. Learn more about our products, order literature, download technical and safety data sheets, or connect with your Lucas Milhaupt manufacturer's representative today.

HVAC/R Distributors

brazing education, get better at brazing, brazing school

Educating HVAC/R service technicians on best brazing practices

Lucas Milhaupt has been the trusted brazing alloy and joining solutions of HVAC/R Service Technicians since our Sil-Fos patent was released for WWII. We offer how-to videos and in person training to help Service Technicians braze stronger joints in the field. Refresh your brazing knowledge, join a NATE certified training course, or learn where to buy Sil-Fos today.

HVAC/R Service Technicians

Brazing with Aluminum for HVAC/R

In the last three decades the HVAC/R industry has steadily moved toward aluminum brazing solutions. As a lightweight, corrosion-resistant alloy, aluminum can be a cost-effective solution for heat exchange coil construction. Learn more about our innovative, patent pending triangular brazing ring and flux cored brazing rings for return bends, or U-bends.

Browse Aluminum Brazing Solutions

looking for
BRAZING TRAINING?

Learn from the best: Our braze training courses give Service Technicians an opportunity to train alongside industry experts that helped design the coils, compressors, evaporators, and condensers that you work on in the field. Learn how to braze copper to copper or copper to aluminum for HVAC/R repairs.

View Training Courses