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 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 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 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 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 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 Jul 11 22:44:50 EDT 2012 | joeion
Why cannot reply????
Electronics Forum | Wed Jul 11 22:48:54 EDT 2012 | joeion
It is correct to remove moisture in PCB by baking. But I think the time and temperature is too little. According to our experience, it should be more than 60min at 120 centigrade degrees.
Electronics Forum | Thu Jul 12 02:15:53 EDT 2012 | thmeier
Check also the specs / recommendations of your PCB manufacturer. We bake boards 4h/120°C before reflow and after automated cleaning (it´s not FR4!) and also if we have to rework with the autometd rework- stations (massive IR underheating ,..). Regar
