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Article #348Re: Does multicore solder deteriorate with age?
From: Mark Harriss
Date: Fri, 10 Apr 2009 12:46
Date: Fri, 10 Apr 2009 12:46
27 lines
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2636 bytes
Jack Jones wrote: > In a burst of enthusiasm when I was much younger, I bought a large reel > of solder which I barely used. > > It must have been at least 20 or more years ago. It looks similar to this: > http://img-europe.electrocomponents.com/largeimages/C557130-01.jpg > > Now I need to do some soldering again. Would that old 60/40 multicore > of mine have deteriorated? > > I'm thinking the rosin in the multicores may have gone off in some way > because when I tin the tip and then leave it unused for 10 minutes, it > turns brown and uneven on the tip. I'm using brand new tips. > > Maybe this is normal and happens even with less old 60/40 solder? > > It's normal: Wipe the unused solder's grey oxide layer off with a tissue taking care not to stretch the solder and break up the flux inside it and then see how it solders. Rosin flux always goes brown as the volatiles come off as smoke and then the remainder goes brown and then black. That's why you have a damp sponge handy to wipe off the gunk with.
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