Electronics Forum | Fri Oct 20 14:13:32 EDT 2000 | DENNIS XIONG
Dear all, We have a PCB design mistake that causes exposed copper layers on the edges of breakaway locations. Although we fixed the design, but we already made a lot of boards plus many made before we found the problem. I wonder if any one have some
Electronics Forum | Sat Oct 21 03:55:14 EDT 2000 | DL
Dennis, I've seen this before, and in our case we didn't need to seal the edges because there was no concern of shorting or anything in the end product, this is a choice you will have to make, Does your end product have any protrusions or mounting h
Electronics Forum | Tue Jan 12 11:14:37 EST 2016 | mfgengr2016
After the CCA is been de-paneled I find exposed board fibers. Should the board edge be sealed with an epoxy to keep moisture from getting into the CCA?
Electronics Forum | Thu Jan 14 09:25:34 EST 2016 | davef
IPC-A-610F 10.2.6 Laminate Conditions - Depanelization talks to the acceptability of the depanelization criteria for assembled boards. There is no requirement for moisture sealing with epoxy or other material. Basically, the standard requires that th
Electronics Forum | Fri Oct 18 12:55:12 EDT 2002 | mmulgrew
We are currently experimenting on an 18 layer 2 oz. copper backplane. The spec is calling for 100% solder joint top to bottom. Any input greatly appreciated.
Electronics Forum | Mon Oct 21 18:31:45 EDT 2002 | MikeF
Mike, If your wave solder machine doesn't have enough preheat capacity you can put the board in an oven and warm it part way before you put it into the wave solder machine. This works best with a spray fluxer, as a warm board will collapse the foam
Electronics Forum | Mon Oct 21 11:49:20 EDT 2002 | sueph
Mike, We are currently wave soldering several assemblies with with a lot of ground plane. The soldering handbook we have in house suggests a preheat temp for metal core multilayer boards of 230 to 270 degrees F' (110 to 130 C'). It was scary at fir
Electronics Forum | Sun Oct 20 19:42:29 EDT 2002 | sjpence
Like Russ, I am also curious about the 100% fill requirement. On any thick, high mass board the key is getting as much heat as possible into the board. If you get the board to the proper temperature, solder will flow just about anywhere. As an alte
Electronics Forum | Fri Oct 18 16:24:05 EDT 2002 | russ
Big BIG BIGG wave with a lot of preheat capability both top and bottom. You may need to exceed the standard "100 C" top side preheat to 120C or so (be aware of any topside SMT going into reflow over the wave). A spray fluxer with very fine atomizati
Electronics Forum | Tue Sep 11 04:39:14 EDT 2018 | cannizzaro
If you need to know the exact copper thickness of the board, you can ask the Fab to offer the microscopic report, I have already made a 2oz board in ALLPCB before and asked them offeed me this report,usually normal factories can offer it but need add
