Electronics Forum | Wed May 08 14:24:22 EDT 2013 | wahahasteven
we are using acrylic conformal coating on the PCB. Under the same program, same parameters (not changing anything on the machine), and we always found one or two boards have some spots which are not coated (shown as picture). The location of the spot
Electronics Forum | Wed May 08 20:14:24 EDT 2013 | davef
What happens when you rework those non-coated areas? Please list your rework steps Br, davef
Electronics Forum | Sun Nov 22 19:53:10 EST 2009 | prodrivegsr
Hi Ju Yong, The PCB are dry in an airseal cabinet(Staging Chamber) before IR Oven. The bubbles show at around body and solder joint area. You mean the moisture will create bubbles ? Able to advice the humidity and temperature that you are using in
Electronics Forum | Sun Nov 22 18:40:47 EST 2009 | 89jeong
Hi The bubble shows only around component body after ir reflow. I think bubble means that there is a moisture. How do you dry the PCB(?) before IR reflow? Thanks Ju-young.
Electronics Forum | Thu May 09 13:49:24 EDT 2013 | davef
First, it appears that your solder mask and your coating material appear to be incompatible. Second, IPA leaves a residue that's probably not compatible with your coating material, either. IPC-HDBK-830 - Guidelines for Design, Selection and Applic
Electronics Forum | Thu May 09 10:12:08 EDT 2013 | wahahasteven
this is one of my project. I have tried to remove coating only on those areas with alcohol and thinner, then program the machine to coat the removed area again. But the result obviously shows that two different tones of coating on the board. I also
Electronics Forum | Fri Dec 18 09:07:24 EST 2009 | tommyg_fla
dave, where I work they are having the same problems with 1B31 acrylic. The coating thickness is 6-8 mils dried so that have to do several passes with an air dry between them and a final oven cure. They think that it might be related to the heating r
Electronics Forum | Fri Dec 03 15:56:47 EST 2004 | Indy
Hi Everyone, Could someone please tell me - What happens if a N-type connector having chromate coating over silver plating is hand soldering to a PCB. Does the Chromate coating form a compound with silver, Or does it come off while cleaning excess
Electronics Forum | Fri Feb 13 09:46:51 EST 2004 | roertner
You might want to check int using a BGA underfill material prior to coating.
Electronics Forum | Thu Feb 12 14:26:22 EST 2004 | Kris
Hi all, We have a PCB without any BGAs on it which goes into harsh environment.We therefore conformal coat it. After assembly the PCBs are expected to withstand "85degc/85%RH for 1000 hours" We now want to add a BGA to the PCB. Does any one have
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