Hard Soldering Flux Recipe

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How do I make flux?

Hard Soldering Flux Recipe

50 grams boric acid crytals
32 grams sodium phosphate
34 grams powdered borax
1 pint distilled water.

Mix and bring to a boil.

   

Comments

2/18/2012 7:19:16 PM
Brandon said:

I am a novice jewelry maker and was having trouble soldering onto copper. After trying a few commercial fluxes with no luck and experimenting at home, I was able to get a good bond with a flux made as follows:

- 3 parts borax, found in laundry aisle
- 3 parts boric acid (roach poison powder, 64%)
- 2 parts rubbing alcohol

I've only tried this with copper so far, but it should work on other metals I would think.




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