Electronics Forum: chromatography (Page 6 of 8)

Re: white residue

Electronics Forum | Wed Jan 27 21:02:53 EST 1999 | Dave F

| 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 temperatu

Re: white residue

Electronics Forum | Thu Jan 28 08:58:10 EST 1999 | Peet

| | 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 tempe

IC Contamination

Electronics Forum | Mon Oct 22 17:37:51 EDT 2001 | davef

I�m aware of no such standard. There may be something in Euroland [ie, IEC, etc.] TM-650 �Test Methods Manual� has procedures for measuring various types of contamination, such as: * 2.2.25 �Detection Of Ionizable Surface Contaminants� * 2.2.27 �Cl

omega meter

Electronics Forum | Wed Mar 06 21:16:17 EST 2002 | davef

�What does 5 micrograms of chloride mean to me?� * With SIR testing, you can show no detrimental leakage currents under humid conditions, no corrosion, no metal migration, which are the big factors in figuring out electrochemical reliability. People

changing from no-clean to clean

Electronics Forum | Wed May 22 08:43:40 EDT 2002 | pjc

I have experience cleaning NC for military boards. The reason for cleaning the NC is due to conformal coating requirements. Zestron Vigon A200 and Atron AC 100, as well as Petroferm Hydrex DX have both been effective at cleaning Alpha UP78 NC paste.

Pinhole Solder Joint Reliability

Electronics Forum | Mon Jul 21 08:34:44 EDT 2003 | Don Bell

Blow holes/ pin holes in solder joints are the result of multiple root causes. Suggested analysis might look like this; 1) What method of solder preservation is used on the bare board. (hasl,enig, osp, etc.) HASL can leave unwanted flux residues,

PCB wash chlorine

Electronics Forum | Thu Oct 02 21:00:26 EDT 2003 | davef

Who says the chlorine comes from your tap water? Our PTOW dumps boat loads of chlorine into our water periodically. Sometimes it's so bad you can smell it. We doubt that it is the source of your problem. This chlorine will volitize very quickly,

Ionograph or Omegameter

Electronics Forum | Mon Nov 01 15:57:35 EST 2004 | davef

Both are equally efficient process control tools. Neither is particularly effective in testing ionic contamination. The best way to sell your customer on allowing you to do this is to show them that you understand the WHOLE process and are able

how clean is clean?

Electronics Forum | Thu May 26 19:32:13 EDT 2005 | Mike Konrad

Three popular methods: Resistivity of Solvent Extract (ROSE) Test Method IPC-TM-650 2.3.25: The ROSE test method is used as a process control tool to detect the presence of bulk ionics. The IPC upper limit is set at 10.0 *g/NaCl/in2. This test is p

White Residues

Electronics Forum | Wed Aug 17 14:18:11 EDT 2005 | ppwlee

Dave, Answers to your questions: * From your pictures, the white residue appears to be only on the solder mask. Is that correct? If not, what is the location [eg, solder, nonsolder/nonmask areas] of the residue that doesn't show well in the pictur


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