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How to Make Silver Solder Flux

A brief How-To about making your own flux for soldering.

Flux is an agent used to bond two or more metals when they have been melted and soldered. Flux helps to clean impurities and oxidation from the surfaces of those metals so that the solder can bond with the pure metal, creating a strong connection. It also helps solder to flow more easily. Otherwise, it would form beads, or lumps. Metal workers, jewelers, and crafters use flux frequently and it is possible to make your own flux at home with only a few key ingredients. Here is a step by step guide on how to make your own flux from the comfort of your kitchen.



Table Salt



Mixing bowl or container with lid

Measuring cup



1. First, you will use the spoon and measuring cup to add 1 cup of borax to the mixing container. Borax can be found at most hardware stores and some grocery stores in the isle that has the laundry soaps and powders. (Borax is a powder used in most laundry detergent, so look near the detergent.)

2. Next, you will need to add 1/2 cup of table salt and mix the two dry ingredients together until blended.

3. Depending upon what type of flux you are trying to make, you can either use this dry flux formula, or you can also mix water to make it into a paste. Dry flux works just fine, but if you decide to add water you can add just enough to your mixture to make it into a pasty form. (Start off with little amounts of water and add more until you get your desired consistency.)

4. Use the flux as needed after you've made it successfully and to your liking. Place the lid on the container and keep it there until you are ready to use it again.

5. Be sure to seal up the containers of the ingredients you have used and to clean up any product you may have spilled while mixing. Wash your hands as well.


-Liquid flux is a bit easier to work with, while dry flux is commonly used to sprinkle on harder to reach areas.

-Potash can be used as an ingredient as well. Use the same amount of potash as borax and follow the recipe the same way from there.

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Comments (4)

Where would I get potash for this flux?

Where would the hobbyist get potash for this flux?

Where would the hobbyist get potash for this flux?

hi there! i just saw this post i had to order mine (potash) and i\'ve been cooking it for awhile now actually at this moment what i got is palm bunch ash or organic potash its a water soluable i\'m having a hard time getting it to dissolve i have mine in a quart jar and boiling it along with the borax and salt its very gritty hoping it will finish dissolving if it doesn\'t i\'m gonna have to strain it then cook it some more i added more water thinking it will evaporate it\'s hell just getting half the story for us newbies lol i\'ll repost if it works well or you can e-mail me at