Electronics Forum | Tue Dec 19 16:26:24 EST 2006 | samir
Grant, Newer lead-free fluxes have 6%-10% solids content - more activator, therefore leave more "visible" residues. Old technology tin-lead fluxes got down to as low as around the 4%-6% range (I'm going off memory, so me might be wrong)... You'll
Electronics Forum | Tue Jun 06 19:03:59 EDT 2017 | zsoden
Hi Steve, I just confirmed with the manufacturer and the HASL is tin/lead (or it is supposed to be, at least). Any suggestions for how to test for nickel vs tin/lead? We're using an alcohol based no-clean flux from Alpha.
Electronics Forum | Wed Apr 01 07:20:51 EDT 2020 | proceng1
The brush also turned yellow.
Electronics Forum | Wed Apr 01 12:45:31 EDT 2020 | emeto
And this is why you see it only in Leaded process I guess.
Electronics Forum | Fri Mar 02 11:44:51 EST 2007 | sueph
Dave, our facility does only military and aeorspace contracts, we still use only tin/lead solder and 186 Rosin Flux, so this info is just what I need. Thanks for your imput.
Electronics Forum | Thu Nov 04 07:51:41 EDT 2010 | leemeyer
I am in need of a 250 gram jar of Indium Corporation solder paste #81800. This is a tin lead alloy 63/37 with type WMA-SMQ62 water soluable flux. If anyone has an extra jar that is not past it's expiration date please contact me.
Electronics Forum | Wed Apr 01 11:41:34 EDT 2020 | emeto
Very interesting.Safety datasheet suggest acid that might turn yellowish. I am interested is it cleaned easily with water?
Electronics Forum | Wed Apr 01 11:48:16 EDT 2020 | proceng1
We did not try using water. Once the nozzles were left in the pot a while longer, the yellow goes away. Suggesting that it's cooking off.
Electronics Forum | Thu Apr 02 10:06:51 EDT 2020 | stephendo
If you can find some, you might want to give Adipic Acid a try. It is a powder but I have seen it work well.
Electronics Forum | Wed Apr 01 07:18:29 EDT 2020 | proceng1
We are using Superior 515 flux to clean and tin selective solder nozzles. Yesterday the flux turned a bright yellow (like a highlighter) when heated after the flux being applied. This does not happen with our Lead Free solder, only the Lead alloy.
