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 | Sat Sep 13 09:36:53 EDT 2008 | davef
Lemme tell ya, those are weird looking pix. If OSP boards have not been dried properly prior to bagging and sealing, water can leak from via and ruin the OSP, which will turn black.
Electronics Forum | Fri Dec 16 10:25:14 EST 2005 | GS
Hi Liza - polystirene monolayer (blend ?) could be sealed at less presure, ie 35-40 PSI. Temprature could be 165�-170�C. For sure after sealed you shoud make sure the sealing strength (peel strength)should meet min 15-25 N.(bet avg from 25 to 45 N)
Electronics Forum | Tue Apr 06 10:30:48 EDT 1999 | Scott Davies
Tony Although I agree in principle with Dean that 45 Degrees would be ideal, most of the squeegees I have worked with have been 60 Degrees to the stencil surface. This seems to work best with metal squeegees when printing HASL boards, because the sl
Electronics Forum | Wed Apr 07 11:42:16 EDT 1999 | Tony A
| Tony | | Although I agree in principle with Dean that 45 Degrees would be ideal, most of the squeegees I have worked with have been 60 Degrees to the stencil surface. This seems to work best with metal squeegees when printing HASL boards, because
Electronics Forum | Mon Nov 20 11:58:16 EST 2006 | Rob
We try and do it all (Vac pack, dessicant, indicator card, MSL level, PBT, end termination material etc.) however it throws a spanner in the works if you pull a manufacturer's sealed pack from stock and the vacuum has gone where an edge of a tray has
Electronics Forum | Fri Jan 30 10:29:48 EST 2009 | petep
We have a potential new customer who has special PCB requirements. I do not know a lot of details at this point, but have several questions. One of their assemblies has within it , a MID, Solid foil layer, completely isolating one side of the PCB f
