Electronics Forum | Sun Sep 08 15:07:42 EDT 2013 | davef
PCB designers specify the application of solder mask [eg, varnish, solder stop mask, solder resist, etc] to fabricators to reduce the potential of bridging between two conductive traces during assembly soldering processes [eg, wave, reflow and hand s
Electronics Forum | Mon Sep 27 08:52:11 EDT 1999 | Brian
| i had a problem here, during the wave soldering process, we apply a water soluble mask on the gold finger to protect it from contamination. But after washing, there is still some mask left on the gold finger. | Can anyone pls advise is there any pa
Electronics Forum | Wed May 24 11:35:15 EDT 2000 | Bill Ng
Could someone help to let me know when we are doing stencil printing of solder paste on board with OSP surface finish on the land, the stencil is resting on the solder mask or the land itself. If it is resting on the solder mask, then, the actual pas
Electronics Forum | Sun Sep 08 18:06:30 EDT 2013 | davef
Protect the board: If solder mask protects the board, the level of protection is limited and inconsistent. If you want protection, you need the be thinking conformal coating. Selective ENIG: I believe the reason solderability protection, except mayb
Electronics Forum | Wed Aug 17 22:41:37 EDT 2005 | davef
Peter are you having fun with solder masks erwat? We saw this years ago with LPI solder masks. It shows occasionally with other masks. We agree with Russ. If nothing [eg, alcohol, flux thinner, acetonitrile, or water] dissolves the haze, then it
Electronics Forum | Wed Aug 17 13:57:27 EDT 2005 | ppwlee
We have encountered what appears to be mask discoloration after wave soldering. The areas of concern coincide with the areas that were exposed selectively by fixtures during wave soldering, dominated by one date code of PCB with a slightly different
Electronics Forum | Thu May 25 21:50:27 EDT 2000 | Dave F
Bill: I'd expect better gasketing on a nice flat solder mask surface rather than the edge of the stencil opening mashed down on a irregular shaped hunk of solder attached to a pad. Stop thinking and get printing Dave F
Electronics Forum | Fri Sep 06 17:21:24 EDT 2013 | rodcr
Why do PCB traces need a surface finish? On microstrip (top/bottom) the solder mask does not help
Electronics Forum | Sun Sep 08 15:41:30 EDT 2013 | rodcr
I read an article about signal integrity losses and ENIG applied to all of the traces on the board. Doesn't solder mask protect the traces? Why would you need ENIG on the entire board?
Electronics Forum | Wed Sep 20 12:43:40 EDT 2000 | rcroteau
RF pcb is all gold with no typical land patterns and multiple surface mount components sharing the same pad. IPC-610-B doesn't speak to inspection criteria. The problems I'm seeing are, insufficient solder, skewed components. Some of the pads have
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