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The Knowledge and Know-how Connection
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May 17, 2012
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Is PCB Baking Necessary?
I understand from some sources that PCB baking is not necessary if the PCB is Vacuum Packed by the PCB supplier. Is this true?
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Use the form below to submit a comment.
Stefan Flower, Amptech Inc.
Dupont, Isola, and NASA have done extensive studies which show that flexible circuit materials, lead free resin systems, and ANY laminate if you want the highest reliability, should be baked to remove moisture prior to ANY thermal stress.
It has nothing to do with whether they are "good" IPC 6012 boards. If the boards are vacuum sealed from the fabricator, that's great for the first reflow, but what about second reflow, wave, secondary hand soldering, selective soldering, and rework? What if the vacuum seal is broken for inspection?
The key is there should be minimal or no moisture in the boards prior to any thermal stress which has the potential to vaporize the moisture in the board.
Just as Rich points out, boards should be treated just like any other MSD.
Joe Hughes, Hughes Circuits
Randall Massey, NC,LP.
Ping Wu, LeeMAH Electronics