Electronics Forum | Tue Apr 23 00:45:48 EDT 2002 | ianchan
would like to do a paste change, yet this paste was defined by the end-end-customer. this makes it one heck of a ECN paper trail just to start the evaluation DOE of new paste for this *customer project* group. ah, the politics of working life... wond
Electronics Forum | Tue Apr 23 07:51:39 EDT 2002 | cfraser
I too have experienced this problem on many occasions. Try turning you wave temperature down just a bit. If you spec allows for this it will help. The condition will not totally go away but reducing the heat will help. Of coarse you other option in a
Electronics Forum | Fri Oct 25 04:13:33 EDT 2002 | kcngoi
Hi, No clean mean is no need to clean. Of couse if you usin incompatibility solvent to clean, the white residue will appear. If cleaning is needed, source the suitable solvent and this always suggested by your solder paste supplier. regards
Electronics Forum | Tue Oct 29 08:41:48 EST 2002 | peterpaulmary
from my experience, no clean mean "difficult and cannot clean" Normally, you will observe white residue when cleaning it. You should study the flux in the no-clean solder cream before cleaning it. Or change no clean solder to clean type solder
Electronics Forum | Fri Apr 04 10:02:20 EST 2003 | rdr
Do you reflow both sides of the boards before washing? Sometimes these white residues occur from "burnt" flux. we see this from time to time especially when using hot air and liquid flux. Russ
Electronics Forum | Mon Mar 29 11:15:58 EST 2004 | davef
Grant & JDumont: You should not have this white residue on your wave soldered connections, using VOC flux [but you know that, anyhow]. Applying too much flux is the likely cause. Other possibilities are: * flux contamination * solder contamination
Electronics Forum | Fri Apr 02 06:26:13 EST 2004 | Phil James
Take a look at the downloadable paper on the subject of "White residues" available from NPL www.npl.co.uk/ei (Downloads) By the way, we also suffer from this problem!
Electronics Forum | Fri Apr 02 12:40:59 EST 2004 | Ron Herbert
White residue can often be caused by overheating the flux. When this occurs the flux is polymerized, basically turning it into an epoxy. You can usually determine if this is the problem by taking a pencil eraser to it. If it comes off, you have overh
Electronics Forum | Thu Mar 17 22:14:42 EST 2005 | Chua
Hi Davef, Thanks for your advise...... We are running no-clean process. If there is white residues after few days.....is it cause by those excess flux. Thanks
Electronics Forum | Thu Jul 14 13:45:32 EDT 2005 | slthomas
We've only seen it done by accident, and the result was a lot of white flux residue. You do need to make sure you get it all off, and to do so most likely means using a saponifier like sara suggested.
