I thank everyone for their replies.
30% to 70% seems to be the general guideline.
However, the SMT support group is concern that humidity level over 30% will
cause 'popcorn effect' on the plastic package components.
I believe that it is a valid concern, but is the 30% level limit legitimate?
I would appreciate any feedback from learned colleagues.


Best Regards;
Francis Sun
Mark IV Industries

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