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Old 18th Jun 2019, 10:42 pm   #21
McMurdo
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Join Date: Jun 2009
Location: Staffordshire Moorlands, UK.
Posts: 5,263
Default Re: Liquid Rosin Flux

I've still got some of the fluxite brownish stuff as per that green tin, it really works well on old stuff and makes a satisfying sizzle. I'd agree it should be washed off with IPA though. The LA-CO stuff that farnell sells is similar in effect, cuts through anything.
Recently I had the flux from Rapid, sold as Stannol Rosin flux. It's not brilliant. Good for surface mount and bright components but hopeless with old tarnish.

I used to have some Fry's Powerflow in the yellow tin; its aimed at plumbers I think. Viciously effective on old overheated joints. However I once removed an SMD processor from a board using it, forgot about it during an extended wait for a new chip from abroad, and when I came to it, the pcb pads had all gone green and took me an age to get it back to copper.

I was always taught to wash a board after soldering, with trichloroethane in the old days and now IPA,no matter what method was used, and I still do on all but the cheapest repairs.
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