Electronics Forum: rma flux with white residue (Page 1 of 3)

Problem with flux

Electronics Forum | Thu Aug 20 07:10:46 EDT 2009 | davef

Questions are: * On what portion of the second side of the board [eg, solder only, solder mask only, etc] do you see this white hazy residue? * Could you attach a picture? * You mention cleaning this residue. What have you used to clean the residue?

Problem with flux

Electronics Forum | Thu Aug 20 14:52:40 EDT 2009 | davef

Armando: We're guessing that the white residue is on the laminate also. We believe that the residue has something to do with your low residue flux and water. It could be: * Water contamination in the flux. * Poor selection of preheat temperature that

White residue after cleaning with IPA

Electronics Forum | Sun Jan 26 09:32:55 EST 2003 | davef

But soon after cleaning and drying with IPA, we find a white residue formation. A: IPA will not nothing to clean your board. The white residue is exactly what you should expect. Search the fine SMTnet Archives for background. >How do we avoid th

White residue after cleaning with IPA

Electronics Forum | Mon Feb 03 11:17:55 EST 2003 | Randy Villeneuve

White residues are a common problem when cleaning no-clean fluxe residues. The white residue forms when the flux residue is partialy removed, etc. Alcohol should not be your only solution for cleaning. In general, solvents may attack some plastic par

White residue after cleaning with IPA

Electronics Forum | Sat Jan 25 20:17:40 EST 2003 | ramanandkini

We are soldering a 8 pin TTL chip on to a CEM1 board that has a hot air level soldering. We use no clean soler paste for the reflow process. Now the customer wants us to clean since he is afraid of flux attracting the dust. We have some SMT LEDs that

White residue after cleaning with IPA

Electronics Forum | Mon Jan 27 12:02:00 EST 2003 | Mike Konrad

Dave is correct. No-clean flux + water = white residue (unless the proper chemical is mixed with the water). Additionally, no-clean flux + IPA = white residue. Many saponifiers work well as do other cleaning agents. White residue may also be a re

flux on PCB's after cleaning

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

PCB with stains bleach after flux aqueous wash

Electronics Forum | Thu Feb 12 12:30:16 EST 2015 | stevezeva

I remembered something from the TechNet a long time ago about heating the board with a heat gun to see if the white spots disappear. I searched the archives and found this from Bill Kenyon: Quick identification of solder mask white spots- if it is t

RMA flux Based Solder Paste

Electronics Forum | Thu Oct 04 21:52:34 EDT 2001 | sjlevin

If you do not have one of the big in-line aqueous cleaners, then there is an easier way that is a lot less expensive. I suggest you try Asahi's AK-225T vapor degreasing solvent which has been around for 10 years now. And it is legal. If you have

RMA flux Based Solder Paste

Electronics Forum | Mon Oct 08 21:05:00 EDT 2001 | ksfacinelli

DO NOT Mix Technologies.... If you are using a no clean solder paste use a no clean wave solder process. I have direct experience with using a no clean paste and a RA water-soluble wave solder process. When cleaning with the water wash system your

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