Electronics Forum | Sat Nov 08 09:42:22 EST 2003 | ethercom
Hi: I have seen this problem before. It is caused by improper curing of solder mask by the fab manufacturer. When you run the board thru' wave solder, and then wash the board, you see the problem of white residue. However, when you apply heat, you c
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 | Wed Oct 18 09:44:38 EDT 2000 | mike weekes
we're considering PWB finishes other than HASL - the uneven plating contributed to defects and the residues exceed our goal for PWB cleanliness. What success have any of you had with CuOSP, Immersion Silver, Gold or other finishes? Did you have to
Electronics Forum | Wed Jul 11 18:42:35 EDT 2001 | Darby
As I mentioned in the previous string we are happy with Electrolube "SSS". The guy who built our ulrasonic cleaners recommended it and it works very well. You don't have to change tanks or machines for a switch from paste to adhesive. It doesn't leav
Electronics Forum | Mon Dec 27 12:44:20 EST 1999 | jacob lacourse
If it's what I think it is you have a white residue on the legs of some of your fine pitch parts. We have came across this problem some time ago the way we eliminated this problem is to make sure your w/s solder and your liquid flux is compatible.
Electronics Forum | Wed Jul 31 12:47:34 EDT 2002 | mzaboogie
Hi Patrick, We are using AIM 266-3. The topside preheat temp is approx 100 degrees C although we have played with that number both up and down. Raising the temp leaves a white residue, lowering the temp (below about 90 degrees) and the solder balls
Electronics Forum | Thu Aug 01 08:31:51 EDT 2002 | patrickbruneel
Christopher, It looks like you might be close to the solution for your problem because you mentioned that you can make the solderballing worse with lowering the preheat temp. This means that the preheating has a significant impact. I would suggest t
Electronics Forum | Wed Feb 26 22:22:00 EST 2003 | Grant Petty
Hi, The guys here have some boards that have been reworked however as we use no-clean paste we are getting the white residue after ultrasonic cleaning. We are using an alcohol based cleaner in the ultra sonic cleaner. Does anyone have any ideas, or
Electronics Forum | Wed Jul 23 10:44:40 EDT 2003 | ADAM
Guys I was wondering if anybody out there had any suggestions for cleaning populated pcbs that have been contaminated with salty sea water . There is alot of evidence of white residues and salt deposits on the pcb's. I've tried putting them through
Electronics Forum | Mon Feb 23 20:27:27 EST 2004 | greg york
Is this a white residue on the joint and surrounding area's, if so the only thing I can remove it with after cleaning is an Isopar(Isoparrafinic hydrocarbon), my guess looking at other pastes where I have seen this is it is a type of wax used in form
