Electronics Forum | Mon Apr 16 17:36:25 EDT 2001 | steveb
Does anyone know of a reason, other than visual, contact, or testability, for cleaning a no-clean residue off a board? Are there any SIR or long term reliability advantages to cleaning a no-clean residue?
Electronics Forum | Tue Jul 28 07:42:07 EDT 2009 | Mike Konrad
Hi Sean, No-clean flux does leave a residue. Under the best conditions, it is invisible. There are many factors that can cause the residue to become visible such as an inadequate oven profile (or lack of proper preheat on a wave). Also, if wave s
Electronics Forum | Wed Jan 27 19:42:34 EST 1999 | parag palshikar
i am working with the noclean process and getting white residues on the bottomside of the board probably due to the wave soldering flux.i am using a no-clean solder paste and a noclean wave solder flux.The boards passed the accelerated temperature a
Electronics Forum | Tue Aug 22 13:55:44 EDT 2006 | Steve
Using no-clean flux going thru wave when comes out there is a bit of flux residue left on board. If wiped the residue shows a yellowish tint. Any ideas what this means how to get rid of it?
Electronics Forum | Tue Apr 17 12:39:29 EDT 2001 | davef
Continuing with Steve's comments, the true measure of whether or not residues [NC or not] are good or bad is found in the results of an laboratory analysis of the residues and an assessment of the impact of that level of residue.
Electronics Forum | Mon Apr 16 21:21:12 EDT 2001 | davef
Two off the top of my head are: 1 Fluxing / soldering process is either not in-control or not capable. 2 Ionic materials on the board board or components compromise the LT reliability of the product.
Electronics Forum | Wed Apr 18 11:21:03 EDT 2001 | davef
An interesting explanation [from a design engineer perspective] of "skin effect" in RF circuits can be found at http://www.ednmag.com/ednmag/reg/2001/04122001/08john.htm
Electronics Forum | Mon Dec 06 12:27:01 EST 2004 | Scott B
We are currently reviewing a design which has a leadless chip scale package with a solder thermal pad on the underside. The application notes for the device specify use of a no-clean solder paste as the gap under the device will prevent cleaning. Is
Electronics Forum | Tue Apr 17 11:00:55 EDT 2001 | Steve
I have struggled with this myself. Usually where the pressure to clean the residue off is from the people who see the residue but do not understand the characteristics. I have not found a reason to clean residue off. A few people from our design gro
Electronics Forum | Tue Apr 17 19:35:55 EDT 2001 | Brian W.
I have only found one reason to clean the residue. On some high power/high impedance or RF circuitry, that little bit of residue caused electrical performance problems. Other than that, most people who want it cleaned are having it done for vis
