Borax Solder Silver

The borax is a chemical product in the form of a white powder used in many fields of household applications. Whether for cleaning, for experiments or for melting silver, borax is an element that will come in very handy in the household. It is also used as a flux for soldering silver and other metals.

What is a flux

When a casting is made, a special material, called flux, needs to be added. Fluxes are substances that are added to achieve some of these characteristics:

  1. - A flux is needed for the solder to adhere to the metal.
  2. - The flux also lowers the melting temperature of the solder.

3.- Borax reacts with harmful or external elements involved in the welding process, and therefore, thanks to the use of borax, the elimination of these elements is possible.

4.- The layers of oxides involved in the welding process are dissolved.

5.- Borax forms a protective layer on the molten surface which prevents the formation of external compounds on the surfaces during the welding of metals.

How to make a borax flux

We are going to see how to prepare a homemade flux, which can be useful for a long period of time.


To make a silver soldering flux with borax you only need 2 large spoons of borax (about 30 grams) and 1 litre of water.

PROCEDURE Boil the water together with the borax. It is important that the pan used is stainless steel. When boiling, the water should be reduced by half. Allow to cool and store, preferably in an airtight container to avoid contamination by other substances. If borax crystals form over time, they can be reheated to dissolve again.

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