Electronics Forum | Tue Aug 25 08:04:26 EDT 2009 | davef
Trapped moisture can be a problem, and one standard recommends baking a PCB for a minimum of 4 hours at 93+/- 5.5ºC before conformally coating. [NASA-STD-8739.1, “Workmanship Standard for Staking and Conformal Coating of Printed Wiring Boards and Ele
Electronics Forum | Wed Jul 17 11:45:48 EDT 2002 | fmonette
The current IPC/JEDEC standard J-STD-033 for moisture-sensitive devices does not include a bake cycle at 90C (it includes cycles at 40C and 125C for non-assembled components in reels or trays). However, the upcoming revision, which should be release
Electronics Forum | Wed Sep 09 09:57:15 EDT 2009 | mikesewell
You mention silver pcbs - baking will accelerate oxidation/tarnishing of the finish. Solderability will likely go down...
Electronics Forum | Tue Aug 25 03:24:11 EDT 2009 | fiona_j
Hello, I have been recently bringing a new RoHS wave soldering machine into production. Unfortunately, I am finding many of the boards are experiencing blow holes. It is always silver plated PCBs and I believe it is related to moisture ingress. I n
Electronics Forum | Wed Sep 09 09:38:53 EDT 2009 | patrickbruneel
Dave is correct (as usual). Baking the boards might reduce blowholes but will definitely not eliminate the problem. Back in my hay days we had a huge problem with blowholes and we baked boards 24/7 with very little success in reducing blowholes (ev
Electronics Forum | Wed Sep 09 08:25:40 EDT 2009 | davef
We understand that you have boards in production that you need to ship. In the future, you could eliminate your moisture caused blow hole issue a lot more simply than baking. Consider requiring that your board fab plate the copper thickness of throug
Electronics Forum | Tue Sep 08 05:40:10 EDT 2009 | fiona_j
Many thanks for the reply. However, surely because it's under 100 degrees, the moisture won't actually reach boiling point. Is this ok?
Electronics Forum | Tue Sep 08 07:07:55 EDT 2009 | davef
We think the idea is to avoid boiling-off the moisture and let it 'cook-off' at a lower temperature to decrease the potential damage to components. If you heat a pan of water on the stove below, but close to the boiling point of water, the water in t
Electronics Forum | Tue Jul 16 01:12:31 EDT 2002 | ppcbs
We find that baking PCB assemblies at 90 degrees C in a Blue M forced air oven is safe for most all PCB's that we have encountered over the past 12 years. We remove any external plactic hardware that may be attached to the assembly and also like to
Electronics Forum | Thu Nov 21 14:17:27 EST 2002 | MA/NY DDave
Hi I can't give you the answer for your question because I have too many questions and would have to know a lot more before I was comfortable giving any advice. I have done mass Baking of piles of PCB's as a needed evil when piles of boards were ex
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