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How to Make Aluminium Soldering Flux

How to Make Aluminium Soldering Flux

Soldering is essential in many industries, including electrical engineering, electronics, and automotive. A key component of any soldering job is the flux – a paste or liquid that helps clean the metal surface before the solder is applied. However, there’s one additional step you must take when it comes to aluminium: creating an aluminium soldering flux. Here’s a step-by-step guide on how to make your own.

What You Need

Before making your aluminium soldering flux, you must gather all the necessary materials and tools. These are:

  • 50g potassium fluoride (KF)
  • 25g ammonium chloride (NH4Cl)
  • 2 tablespoons of borax powder
  • A glass container with a lid
  • A spoon for stirring
  • Safety gloves and goggles

How to Make It

Once you have all your materials ready, making this flux is straightforward. Start by adding 25g of KF into the glass container and then pour 25g of NH4Cl. Stir both ingredients until they are thoroughly combined. Once that’s done, add 2 tablespoons of borax powder to the mix and stir gently until everything is completely blended. Now your aluminium soldering flux is complete!

Safety Precautions

When working with these chemicals, please use safety gloves and goggles throughout the process, as they can be corrosive if not appropriately handled. Also, remember to store your finished product in a cool, dry place away from direct sunlight, as exposure can cause it to degrade over time.


DIY aluminium soldering flux can be made using only three simple ingredients that can be found relatively easily at any hardware store or online retailer – potassium fluoride (KF), ammonium chloride (NH4Cl), and borax powder – plus some basic tools like a spoon for stirring and a glass container for storage. Remember to follow safety precautions when handling these chemicals, as they can be corrosive if not handled properly! With this guide, now you know how to make your aluminium soldering flux at home!

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