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
Electronics Forum | Fri Mar 21 08:56:29 EST 2003 | russ
Is it possible that the flux you used, if applied in excess could have caused the balls to "blow out". I have seen this in the past and it was related to the type of flux we were using and the amount. Russ
Electronics Forum | Sat Mar 22 01:05:47 EST 2003 | bcceng
I agree with Russ, seen this happen if the right amount of paste flux is not applied. You mite want to dip the spheres of the BGA to the layer of paste flux.
Electronics Forum | Fri Apr 04 10:02:20 EST 2003 | rdr
Do you reflow both sides of the boards before washing? Sometimes these white residues occur from "burnt" flux. we see this from time to time especially when using hot air and liquid flux. Russ
Electronics Forum | Mon May 19 02:36:25 EDT 2003 | Thomas
Hi Grant, From what I know, it has something to do with the flux...Imagine if the temp difference of the flux is somehow slowed down..it would reduce the tendency of a stronger pull on one side of the pad...
Electronics Forum | Mon Jul 21 21:59:08 EDT 2003 | davef
Theory #6 [maybe 3a?]: If you change your paste to a 'non-voiding' paste, your problem will go away. It's the flux in your paste that's killing you. The flux gets trapped in the solder and then releases ejacta that form the volcanic openings in you
Electronics Forum | Thu Sep 25 12:27:23 EDT 2003 | John S
Is anyone using an automatic titrator to monitor their flux? If so, can you recommend a product? Is it reliable and easy to use? We are using a VOC free no-clean flux and are titrating manually. Thanks John S
Electronics Forum | Fri Oct 24 17:04:43 EDT 2003 | Joe
Any information on the difference in a thermal profile between lead free and regular Lead profile? Also, why use flux with Lead? Why not with Lead Free? Thanks, Joe
Electronics Forum | Tue Nov 04 16:04:49 EST 2003 | pjc
No don't know about such a chart. But, consider changing the method used to check flux activity. Consult your flux supplier for a test kit that will measure actual activity (acidity). SG is a suggestive method.
Electronics Forum | Tue Jan 13 09:38:52 EST 2004 | mleber
Can anyone provide a list of the top 5 solder paste / wave flux manufacturers by sales? We are evaluating changing to a new chemistry and would like evaluate several of the top manufacturers. Thanks.
