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 | Fri Dec 12 10:28:30 EST 1997 | David Syracuse
I am interested in locating a water soluble resist mask that does not leave a residue after wash and is easy to work with during the screen printing process. I have tried the Alpha Metals 110 and 220 solder mask and have found that it does not leave
Electronics Forum | Fri Nov 07 12:48:31 EST 2003 | rholland
I have seen in the last couple of months more boards with a white hazing under the solder mask. I ran a few tests on a board to determine the cause of the white hazing underneath the solder mask. First I confirmed, or at least I think I confirmed, t
Electronics Forum | Tue Feb 29 21:53:46 EST 2000 | Kelvin Chow
Dear Robert, On PBGA assembly, BGA sphere shrinkage number depends to the following factors, a. BGA Sphere size (before reflow) b. Solder mask opening diameter As far as I know, no formular has been established yet. Most of my friends just collect
Electronics Forum | Tue Feb 29 21:53:46 EST 2000 | Kelvin Chow
Dear Robert, On PBGA assembly, BGA sphere shrinkage number depends to the following factors, a. BGA Sphere size (before reflow) b. Solder mask opening diameter As far as I know, no formular has been established yet. Most of my friends just collect
Electronics Forum | Thu May 26 08:52:42 EDT 2011 | davef
Phil Zarrow wrote a useful paper that could help in evaluating paste. Here read it ... Evaluating Solder Paste � Not An Option Contributed by Phil Zarrow of ITM an Independent SMT consulting firm With soldering being the dominant source of assembly
Electronics Forum | Fri May 31 17:04:02 EDT 2002 | davef
We use boots / shunts er wutt ever you call them to protect solderable component surfaces from wave soldering. Not sure how it would work in your case try: * Kinnarney Rubber 450 Main St. P.O.Box 37 Mantua, N.J. 08051 609-468-1320 fax 7438 http://ww
Electronics Forum | Thu Dec 18 14:38:41 EST 2008 | easton
I think the BLT solder joints look very shiny for no-lead. We are getting very good top side solder with ours though. They look like this. - Gold Enig plating - Alpha EF-6100 Flux - SAC305 - Preheat topside temperatures at 110 to 120C
Electronics Forum | Tue Jul 29 22:13:59 EDT 2008 | davef
IPA is a fire hazard. Be sure your fire extinguishers are charged and your evacuation plan is current, when using IPA in the vacinity of a wave solder machine. Have you tried DI water? Solutions used in wave finger cleaners include: * Techspray SMT
Electronics Forum | Thu Oct 14 18:23:40 EDT 2021 | mikeybinec
OK, thanks for access a few decades ago when I was a kid, I printed soldermask and legend inks on circuit boards. Printing solder mask, (PC-401, SR1000, LPI) I would use SM-1000 stencil material on 86 or 110 mesh I've been trying to find sm-1000 bu
