Electronics Forum | Thu May 14 14:48:45 EDT 1998 | Dave F
We understand that testing for ionic contamination and surface insulation resistance measure different properties. We assemble printed circuit boards for other companies. We will not get combs on 90% of the boards that we assemble. We have no custo
Electronics Forum | Fri Jul 26 17:02:07 EDT 2002 | davef
Never heard of flux residues forming a lense. The first thing that comes mind when thinking about your 'fog test' is: Ionic Contamination While this seems pretty far afield from your interest in optical effects, I'll continue briefly. A reverse
Electronics Forum | Mon Dec 09 08:30:13 EST 2002 | MA/NY DDave
Hi Well you already got good answers with some diversity, yet from what I read they are giving you the answers for Assembled PWBs, i.e. post solder or PWAs. I don't remember ever doing this for raw boards. For most of the current pwb finishes it se
Electronics Forum | Tue Dec 10 18:30:15 EST 2002 | MikeF
From personal experience, if the PWB vendor is cutting costs and doing their final rinse with tap water instead of DI you will get ionic contaminants left on the board. You might consider having CSL, or one of the other independent labs mentioned e
Electronics Forum | Tue May 18 09:13:08 EDT 2004 | E Wolf
I'd like to follow the thread discussed on assembly. Hope Everyone is ok with that. I do run into the problem (have it now) that Ionic cleanliness is requested by print on a no-clean assembly. My intention is to use the no-clean to skip the aqueou
Electronics Forum | Tue May 18 22:31:05 EDT 2004 | davef
Ionic cleanliness is pretty much meaningless, when discussing nc flux residues. If you do the good solder routine and measure the boards, you'll be in the out-house, because the water in your resistivity of solvent extract tester will turn the res o
Electronics Forum | Thu Sep 02 11:31:19 EDT 2004 | kmorris
Hi: I am wondering what others are doing that use a Static Ionic contaminate test (e.g. Ionograph/Alphametals) in relation to time. Our Ionograph has the option of setting a test time, or setting it to auto-terminate when there is no change in resis
Electronics Forum | Thu Dec 16 09:59:47 EST 2004 | saragorcos
Hi there - unfortunately, there are no good cleanliness specs available mainly because clealiness requirements are case sensitive - you should talk to Terry Munson at 765-457-8095 - he can definitely give you advice on Ion Chromatography, SIR, ROSE t
Electronics Forum | Thu Mar 02 23:21:59 EST 2006 | KEN
I recently finished analysis of no-clean fluxes and Ionic contamination and cleaning processes. The results were eye opening. Summary: If you clean a no-clean you better do a good job. Many no-cleans produce a "waxy binder" to encapsulate the tro
Electronics Forum | Tue Apr 03 17:13:33 EDT 2007 | kmorris
Just wanted to do a poll to see how others are determining their test time for Ionic testing. Test Method IPC-TM-650 number 2.3.25, section 5.3.3, says "The test time should be in accordance with the monitoring plan criteria (set time or auto-shutof
