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The Knowledge and Know-how Connection
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June 19, 2013
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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?
Expert Panel contributors for this topic:
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Richard Heimsch, Director, Protean Marketing | |
Joe Karcewski, Product Manager, APS-Novastar, LLC | |
James Mahoney, Applications Project Manager, Quick Turn Flex Circuits LLC |
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Views: 4218
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Try the IPC-1601 Printed Board Handling and storage guidelines.
Stefan Flower, Amptech Inc.
I couldn't agree with R.M. more!
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
Get some different experts. Have them study material moisture absorption characteristics. It is obvious they are in the assemble end of the business. Why not ask the people that make the material and look at their charts. The guy in marketing knows more than the two guys in manufacturing operations. Lord help us.
Randall Massey, NC,LP.
Do IPC documents require vacuum package for all PCBs? What IPC document covers this? We often receive PCB in unsealed packaging.
Ping Wu, LeeMAH Electronics