Electronics Forum | Fri Sep 18 09:25:16 EDT 2009 | ysutariya
There's not really a good answer except that I think that the industry wasn't really prepared for such an increased use of white soldermask combined with the importance of using the white as a reflecting surface. Essentially, the resins commonly u
Electronics Forum | Mon Jun 14 15:18:49 EDT 2010 | jmedernach
Hi Phil, If the areas that are "turning gray" are masked, it would lead me to believe that you're simply oxidizing the SnCuNiGe finish on those areas. It's unsightly but not an actual defect. I think it's simply the biproduct of using SN100C as a s
Electronics Forum | Wed Sep 10 12:44:55 EDT 2008 | vladig
Well, it wasn't as easy to figure out the root cause. The last image is below. It shows how the board finish looks like (the trace was under solder mask). AS you can see, the layer of E-Ni is spliting (the board shop admitted the problem afterwards).
Electronics Forum | Tue Apr 23 15:36:27 EDT 2019 | davef
Josh, are you setting someone up with these questions? Answers to your questions related to the subject line follow: Q1. Does the Epoxy Solder Mask Layer of a PCB protect against moisture absorption? Is this a primary function of the solder mask?
Electronics Forum | Wed Feb 20 15:20:34 EST 2013 | hegemon
Depending on your requirements, you could range from a hair dryer, heat gun, toaster oven, hot plate, on up to digitally controlled surfaces and convective systems. You'll have to gauge for yourself whether you are just trying to add some heat energy
Electronics Forum | Fri Feb 20 13:01:26 EST 2004 | Jay
First, it depends on the alloy composition of the solder. As you might know, eutectic Sn/Pb solder has the lowest melting point among available conventional solder systems. (except those based on Sn-In and Sn-Bi systems.) For example, 63Sn/37Pb - 183
Electronics Forum | Fri Aug 13 09:09:11 EDT 2004 | davef
Solderability standards are: * IPC EIA J-STD-002B - Solderability Tests for Component Leads, Terminations, Lugs, Terminals and Wires * IPC EIA J-STD-003A - Solderability Tests for Printed Boards Not intending to insult you, but terms used to descr
Electronics Forum | Tue Feb 28 07:50:06 EST 2006 | amol_kane
we have used blue and red color solder mask on a trial basis for our LF assemblies. We are performing expts using Imm Sn and Imm Ag to determine the best surface finish. Also, we pass the LF baords thru the same inline wash as you dont wash away the
Electronics Forum | Tue Feb 10 15:13:06 EST 2004 | patthemack
Hey Vinny, Sorry I haven't looked at this for a while. 3 things to try: Tombstoning- The ground plane side is larger because the solder mask allows for a little slop at the board shop (clearance around a pad of a few mils). Since there is not a defi
Electronics Forum | Tue Dec 22 12:32:16 EST 1998 | Earl Moon
| Folk's, | I'm in need of some help / direction. I'm working on my thesis for a masters based on looking at the effect's of the solder resist promoting / reducing the amount of solder ball's during wave. I'm looking at thing's like colour, texture,
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