Electronics Forum | Thu Oct 12 17:56:58 EDT 2000 | DennisF
The white residue can be caused by putting Alcohol on the no clean product. Some people will attempt to clean an area they have reworked.
Electronics Forum | Wed Oct 11 10:29:28 EDT 2000 | G. English
Try the following steps : FIRST CHECK THE ARCHIVE for further information, it WILL help you. Step One : What�s the chemical analysis of this white res? Obtain a sample. It could be tin, rosin, or something else??? Step Two : The fastest way I know
Electronics Forum | Fri Oct 13 05:21:08 EDT 2000 | Robert Steltman
Looking at the original post, it seems that the white residue is formed on the board after wave soldering and becomes evident when it has been left standing for a while. From what I understand, it seems that the solids content of the "no clean" flux
Electronics Forum | Sun Jul 29 09:17:20 EDT 2001 | davef
Tough to say, but ... Chlorine: Many fluxes contain chlorine. Sulphur: Many solders and paper packing materials contain sulphur. Sodium: No idea. IPC-J-001 talks to board cleanliness and specifies criteria according to the cleanliness test met
Electronics Forum | Fri Mar 02 15:52:19 EST 2001 | jagman
This happens to be after the water wash process. These are Burn-In boards so an SMT epoxy is used prior to wave. The flux used is Kester 2331ZX. Would using a thinner cause this to occur? The residue is all over the board. Thanks.
Electronics Forum | Fri Oct 13 15:16:43 EDT 2000 | Dave F
George and the others make good points. Check Les Hymes response to a similar question in 7/00 "Circuits Assembly"
Electronics Forum | Fri Mar 02 16:47:39 EST 2001 | traviss
If the thinner you are using is 4662 and the correct amounts that should not be the problem. Is this the first solder operation? I would start by looking for rosen or no clean flux getting on the boards at some point before wave soldering and not bei
Electronics Forum | Sat Mar 03 03:56:04 EST 2001 | wister
I had confused by same problem, the reason I found is the interval between wave soldering and cleaning is too long and did not set the temp. of D.I water at 120F~150F. Kester flux is good. Rgs, Wister
Electronics Forum | Fri Mar 02 15:44:26 EST 2001 | traviss
Is this after wave or wash? Its too bad the archives are gone this one has come up a bunch of times. Most of the time its caused by rosen or no clean flux being put through a water wash. There are several other possibilities. You will probably hear w
Electronics Forum | Sun Aug 29 19:17:34 EDT 2004 | aqueous
Chen, It is always best to place one�s effort on determining the cause and content of the residue rather than trying to work around it. The first thing you must determine is the nature of the residue. Is it flux? In many instances, the residue is
