Electronics Forum | Wed Apr 27 09:15:30 EDT 2005 | russ
You will probably need to change paste. If I remember correctly the SMQ92J has a post reflow residue of 40%. This is one of the highest post reflow residue levels available. PIH uses a lot of paste which means a lot of flux residue. There are othe
Electronics Forum | Wed Apr 27 13:49:11 EDT 2005 | Shean Dalton
Hi Sarag, We share Sara's described experience with cleaning No-Clean/Low Residue flux residues. We can add that of the Low Residue residues, Indium SMQ92J is one of the more challenging flux residues to clean. That said, we have had repeated succ
Electronics Forum | Wed Apr 27 10:52:52 EDT 2005 | saragorcos
Have you examined what type of residue is present? It is possible that what you are seeing is benign, though flux that is not fully activated often leaves harmful residue species such as chloride or weak organic acids. If you don't want to change p
Electronics Forum | Wed Apr 27 04:16:54 EDT 2005 | Bryan
Hello everyone, During our PIH process we found much flux residual around or on the joints of PIH after reflow.We use the Indium smq92j no clean solder paste.but the residual is too much to be accepted.can anybody share with me some ideas to solve th
Electronics Forum | Tue Aug 16 11:27:14 EDT 2005 | saragorcos
Hi Peter, I posted these links to Technet as well, but figured I would add them here as well in case any of the smtnet readers would like to see them. Here are some links to some articles about white residue sources, and whether or not white residue
Electronics Forum | Tue Dec 26 20:11:47 EST 2006 | davef
What is the make-up of the residue? Is finding this residue new to your standard operation? What has changed?
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 | 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 | Wed Sep 02 11:54:34 EDT 2009 | davef
You can determine empirically what will work. * Use ion chromatography [IPC-TM-650 2.3.28] to evaluate the residues and determine if the residues must be removed. * Use energy dispersive spectroscopy for the elemental analysis or chemical characteriz
Electronics Forum | Tue Jul 28 01:39:32 EDT 2009 | Sean
Hi All, I have some question about flux residue resulted from non clean process as following: 1) Under what kind of circumstances that flux residue could appear? This residue does not happen during production but did appear after some period of ti
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