Saturday, June 15, 2024

How do I make soldering flux?

How do I make soldering flux?

If it is for lead-tin electronic soldering, the rosin flux inside the solder is mostly colophony (pine rosin). The same stuff used on violin bows, and that pitchers have it powdered in a bag.

Mix it with half 99% isopropyl alcohol, half denatured alcohol to make a liquid. It will take several days to completely dissolve, just be patient. I bought a box of a dozen empty fingernail polish bottles.

Put the powdered pine rosin in first, then top it off with the alcohol mixture.

Colophony is sold in drug stores, and on Amazon. It comes from pine sap and has quite a few uses.

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