Electronics > Repair
Restoring dried solder flux paste
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Trurl:

--- Quote from: Ian.M on February 05, 2021, 11:01:33 am ---... avoid 'violin rosin' as it may have additives undesirable in flux.  If the country isn't 'dry' you can probably also get 95% pure ethanol, though you may have to settle for denatured alcohol.   Provided you let the mixed flux settle out and decant it to remove undissolved solids, detritus that was embedded in the rosin, and any aqueous layer, the resulting liquid flux is comparable to commercial ROL0 (unactivated rosin 'R') flux.

--- End quote ---
I have some approximately 30 year old D'Addario Rosin DARK (for violin bow I used on a Korean gayagum zither), 95% ethanol, and "fancy" Vaseline brand "petrolatum", so for a moment I considered the possibility of  making my own "brew".  But considering this rosin's ingredients: American Gum Rosin, Natural Beeswax, Castor Bean Oil, Tar and also the confession by someone that has made something that works such as jpanhalt that he, "would never consider making, rather than buying a flux" I've decided to face practical reality, and just order some Chip Quick SMD291.

Thank ya'll for this crazy ride. I'm sufficiently "de-ignorantized" about soldering paste. >:D Cheers~
helius:
Tar would be an undesirable additive, because of its tendency to stick tenaciously to surfaces, which would impair cleaning. Along with the castor oil, its function in violin rosin would seem to be to prevent flaking off when the bow is used.
The smell of hot tar would be impressive, however.
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