Electronics Forum | Tue Aug 17 13:32:13 EDT 1999 | Brian
| Can anyone help on the subject of de-wetting during the spray coating process. We use PC29M Parts A+B spray coating material, Humiseal tapes and masking dots, Marigold supertouch V70N gloves and Concoat CM533 liquid masking material. We also use a
Electronics Forum | Thu Jul 22 16:30:59 EDT 2010 | dyoungquist
It is likely that the pads that will not solder have been contaminated. There is something on the surface that is preventing the solder from flowing.
Electronics Forum | Sun Dec 16 04:55:33 EST 2001 | Ramanandkini
Mr.Dave.F has given an exhaustive answer. I just want to mention that some attention could be paid to the plating & contaminants on the PCB. We have experienced longer soldering time due to the presence of contaminants on the plated surface.
Electronics Forum | Fri Nov 05 09:52:44 EST 1999 | Dave F
John: Three things: 1 You are correctamundo!!!! What's the difference between slopping alcohol on dirty boards and washing dirty boards? Clean boards!!!! By the time those very nice people get done with their alcohol cleaning (a nip for the boar
Electronics Forum | Tue Jul 15 12:39:43 EDT 2003 | sam
Thank you Russ for your comment. This failure cause should have been confirmed as contaminated plating surface causing poor solderability and conductivity, according to all the testing and observations. The only question remaining to me is that why
Electronics Forum | Mon Dec 13 00:05:28 EST 1999 | Dennis O'Donnell
I can't figure out why everyone is plating everything with gold. According to the J Standard, gold plating should be removed before soldering to the surface. The gold, when left on the surface to be soldered will contaminate the solder joint and ca
Electronics Forum | Wed Oct 18 16:33:26 EDT 2000 | Dave F
Mike: An omega meter has very little to do with ion chromatography. * IPC TM-650, 2.3.25B, Detection and Measurement of Ionizable Surface Contaminants is a process control method that washes boards with an isopropanol / water solution and measures
Electronics Forum | Thu Aug 19 19:04:55 EDT 1999 | Brian Wycoff
| | Can anyone help on the subject of de-wetting during the spray coating process. We use PC29M Parts A+B spray coating material, Humiseal tapes and masking dots, Marigold supertouch V70N gloves and Concoat CM533 liquid masking material. We also use
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 | Thu Oct 05 07:23:34 EDT 2006 | Chris
Hi all experts, I have no background about PCB or SMT process. I am now encountering some issues after SMT - Unstable stitch bonding condition. I am now suspecting some contaminants remain on lead after cleaning. Therefore, how can I check th
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