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.
Electronics Forum | Mon Jul 18 00:00:35 EDT 2005 | adlsmt
I have nothing to add technically but we have been washing no-clean for years. Use very clean filtered DI water to avoid the white residue issue and some good detergent or sopanifier and you will get great results.
Electronics Forum | Wed Aug 17 17:41:58 EDT 2005 | Kris
What is the surface finish of the board ? Some flux are known to react with certain type of board chemistry. Have you verified the compatibility of your solder mask and flux ?
Electronics Forum | Fri Aug 26 09:48:11 EDT 2005 | David
I have heard that there are problems using immersion gold on PCBs when working with BGAs. Is this correct? Is white tin more suitable?
Electronics Forum | Fri Sep 09 15:50:08 EDT 2005 | chunks
The hand assembled part is soldered in? If so, the white residue may be from the operator using some added wave solder flux to get better wetting when hand soldering.
Electronics Forum | Wed Nov 02 01:51:53 EST 2005 | Adnahn
It is not common practice to perform this function.What is advisible is to cover the PCB surface with white copy paper.Screening onto the copy paper will give you a clear indication of your solder screening profile.This way your PCB's will stay clean
Electronics Forum | Thu Feb 16 11:42:29 EST 2006 | russ
I use Alpha 857 W.S. for wave is that what you mean? If so, I love this stuff, it solders everything. one downside to it is convection (wave , rework) can dry it out and leave white hazes and even residues at the joints.
Electronics Forum | Mon Feb 27 11:32:57 EST 2006 | Rob
If you are going for high margin business then you may want to ditch the blue smurf coats & go for white - they are a bugger to keep clean but look like you have a dedicated team of scientists. (Giving people clipboards & safey glasses helps complet
Electronics Forum | Thu Apr 13 04:50:53 EDT 2006 | Slaine
I had something similar a while back it looked like fibreglass insulation in my case (was using no clean flux not water based), i took some and melted it with a soldering iron and it reacted like flux. and i tried disolving it with acetone.
Electronics Forum | Thu Apr 13 07:08:58 EDT 2006 | amol_kane
did you manage to get rid of it? if so, what steps did you take to eliminate it?
