Electronics Forum | Wed May 15 16:18:58 EDT 2019 | stephendo
Look up the glass transition temperature (Tg) for the PCB material. If you get the PCB above this temperature it will become quite soft. If it is a populated board remember to take any moisture sensitive devices on it into consideration.
Electronics Forum | Wed Jul 04 13:25:03 EDT 2012 | davef
Baking boards to remove moisture takes a lot more energy than you'd think. Following on with this, Chris Hunt from NPL gave a presentation at IPC APEX 2012 about the results of his research ["Impedance Testing for Sensitivity to Delamination in Print
Electronics Forum | Mon Aug 01 18:50:46 EDT 2005 | crishan
Hi Cecil, We using conformal coating in our manufacturing area, we did use to use Humiseal, others have been Bectron and Peters. We recentalt switched all lacquering to Peters, since it is lead free and it is a lot friendly than Humiseal. To answer
Electronics Forum | Tue Aug 14 15:45:06 EDT 2001 | davef
BOARD BAKING SCHEDULE: Bake time depends on the board thickness and construction. For laminated FR4 PCB, we bake between 6 and 24 hours at 100�C. ROOT CAUSE OF THE PROBLEM: Heating moisture entrapped between the laminations of the board too quickl
Electronics Forum | Fri Aug 12 22:10:24 EDT 2005 | Mika
I agree with all the prior postings! But I have some additional thoughts about this. If there is a build up of moistures (% humidity) inside the pcb; before you reflow the pcba; then you will have the result out of the oven, just as you described. My
Electronics Forum | Tue Sep 07 17:12:34 EDT 2004 | davef
No one knows what type of board you use. So, assuming you're talking a fairly standard FR4. Q1a. actually, what is max temperature and duration can a bare PCB reflow without any quality problem? A1a. We'd guess your board could take 250*C for may
Electronics Forum | Wed Aug 29 05:30:30 EDT 2018 | teresat2
I guess these boards only used Fly test. Flying needle test is one of the methods to check the electrical function of PCB (short circuit test). The flight test machine is a system for testing PCB in a manufacturing environment. Instead of using the
Electronics Forum | Thu Jul 01 15:12:16 EDT 2010 | siddharth
Thanks to all for their inputs. @Hexielectronics, I am now trying to assemble the board by attaching it to a frame and removing the frame while waving it. I plan to put the boards back on the frame after the board cools down. Could you explain more
Electronics Forum | Fri Jul 13 08:03:54 EDT 2012 | cobham1
I appreciate all the feedback. The reason I was asking the question is because we have an internal documnet that states we need to bake for 16 hours after the boards are cleaned. This just seemed to long for what little moisture is really removed. I
Electronics Forum | Wed Aug 12 18:26:16 EDT 2020 | SMTA-64387117
Looking for engineers to test new desiccant technology and compare with Silica Beads. Samples provided. Additionally, engineer can work with and collaborate with "engineers only" group lead by US Military engineer for packaging. The goal is to d
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