Electronics Forum | Fri Apr 03 08:22:36 EST 1998 | Scott Cook
| At this moment in time we are using water soluble solder paste on our PCBs these are cleaned using water only, agitated with ultrasonics. After drying a white/grey residue is left around solder joints. Reflow profile is fine and a reliable wash pro
Electronics Forum | Wed Aug 17 22:41:37 EDT 2005 | davef
Peter are you having fun with solder masks erwat? We saw this years ago with LPI solder masks. It shows occasionally with other masks. We agree with Russ. If nothing [eg, alcohol, flux thinner, acetonitrile, or water] dissolves the haze, then it
Electronics Forum | Sat Aug 15 06:29:40 EDT 2009 | abeasia
Help, experiencing discolor of a white solder resist paint after reflow of 250 degree, it turned yellow. Have tried many paints, no luck. Anyone knows one that wouldn't change color and holds the white nicely? Thanks for your support in advance.
Electronics Forum | Thu Jun 07 07:30:16 EDT 2007 | jdumont
What type of residue is it. Are you sure its not the solder mask turning white? Odd that it would only be on the bottom...
Electronics Forum | Fri Apr 26 12:18:24 EDT 2002 | Yngwie
Today the line experienced the white gloves turns green at the point of contact when holding fresh board that came out from wave soldering. Was that the effect of inproper solder mask curing at PCB house during fabrications ? For a proper cured solde
Electronics Forum | Mon May 09 11:29:05 EDT 2016 | jpal
I wanted to bump this up. I am having the same problems. I cannot convince folks it is a solder mask issue and not our process issue, even though it shows up after wave and wash. I can heat the boards and even send them back through the wave preheate
Electronics Forum | Thu Apr 22 20:26:39 EDT 1999 | Dave F
| | On various PCB's after building processes,such as reflow, flowsolder and wash. The soldermask on the PCB's have become discoloured, like a 'marble' effect all along the solder side of the board, it is lighter in contrast than normal, although whe
Electronics Forum | Mon Aug 24 18:45:11 EDT 1998 | Steve Evers
| We are looking at implimenting a bar code system for a SMT | production line. To start we are looking at label printer/applicators. Are there any other companies that we should consider besides Zebra and Imtec?? Thanks for your input. | John If
Electronics Forum | Sat May 30 08:24:09 EDT 1998 | Dave F
| | | | We recently made the switch to no-clean and the wurface mount is turning out beautifully. However, the wave solder process continues to put up a fight; we are getting a white residue on the surface of the PCB. The residue is not locali
Electronics Forum | Sat May 30 12:51:29 EDT 1998 | Earl Moon
| | | | | We recently made the switch to no-clean and the wurface mount is turning out beautifully. However, the wave solder process continues to put up a fight; we are getting a white residue on the surface of the PCB. The residue is not loca
