Charlie B: You mentioned that you have an air conditioned environment and a RH 0rf 50, baking the boards is predominately done when the history of the PCB delivery and / or previous storage conditions are un known. When I was with a CM, we did this as a matter of course ( being in NZ, as we don't have the stable contol wrt to Customers boards). Baking is usually done in a temperature changer, with adequate circulation for each PCB and baked at a constant 80 degrees for 12 hours. A similar practise can be performed with micros to avoid "pop-corning)
The other thing I was a bit conserned about is you mentionedyour shelf life of PCBs. How long you can store PCBs is dependant on the finish. From what I understand HASL, 1 year, then they need to be re done idealy, gold flash, 6 months, and OSP 3 months.
I hope I have helped
Marc
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