Electronics Forum | Thu Sep 06 09:49:26 EDT 2001 | ksfacinelli
This is a real problem. We have experimented with a number of off the shelf products as well as discussed the issue with a few solder manufacturers. As you are aware IPA or Flux off can make the product look worse. I would discuss with the custome
Electronics Forum | Thu Jul 07 15:32:37 EDT 2005 | saragorcos
Hi Lloyd, Have you done any ionic analysis to find out what the flux residue is composed of? If you can eliminate the source residue, then your problem obviously should go away. Though tombstoning isn't known to be much of a functional problem it i
Electronics Forum | Thu Jul 07 18:16:36 EDT 2005 | russ
What size discrete components and have you evaluated your pad geometries? If pads are too far apart this will happen. The flux resudue is simply there because you didn't solder the component. It will stay on top of the solder bump. You can see this
Electronics Forum | Thu Sep 01 12:07:35 EDT 2016 | pavel_murtishev
Is there any field proven spray cleaning technique able to remove flux residues under OSRAM LEDs? Is it possible in principle? The problem is that OSRAM LEDs are low standoff ones and I absolutely have no idea how cleaning agent could get there. Mo
Electronics Forum | Thu Apr 05 07:15:55 EDT 2001 | Jerry
Same query: Do we really need to clean the board with when using RMA ? I've been told that aqeous is not needed to clean the board, what cleaner is suitable and how?
Electronics Forum | Thu Apr 05 12:25:01 EDT 2001 | davef
Talk about bucking the trend!!! OK, OK, I know some US military work still requires RMA. You�re both correct. Cleaning decisions for RMA fluxed boards are based on customers requirements. [Some do (clean) and some don�t.] Older US military speci
Electronics Forum | Thu Sep 06 10:58:54 EDT 2001 | Steve
If I had to deal with this problem, I would switch to water soluble paste. It is a much more cost effective solution.
Electronics Forum | Fri Sep 07 21:43:40 EDT 2001 | mugen
Hi, We use IPA and Prozone, if IPA is so drastically detrimental, to the pcba's.....what suggested alternative, can you please recommend, as IPA replacement? Thanks.
Electronics Forum | Wed Jan 14 08:28:46 EST 2004 | davef
Search the fine SMTnet Archives for background on solder on gold fingers. As we recall: * Paste selection * Proper reflow recipe tuning ... are important.
Electronics Forum | Fri Jul 23 14:41:41 EDT 2004 | Steve Stach
Dear JSK, It sounds like the root causes of your problem are two fold. First, excessive heat will polymerize the abietic acid found in rosin forming neo-abietic diamers and polymers which are much less soluble than the parent monomer. There are
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