I think some of PWB do have moisture levels.  For example, low k or polyimide PWBs might have levels on the spec. due to sensitivity of the board material. 

Joyce Koo
Researcher
Materials Interconnect Lab
Office: (519) 888-7465 79945
BlackBerry: (226) 220-4760

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: Tuesday, December 10, 2013 1:51 PM
To: [log in to unmask]
Subject: Re: [TN] Moisture Level Determination of PCB

I don't think that PWBs actually have MSD levels assigned to them in any IPC standard, like components do with J-STD-033.
However, they SHOULD be treated as MSDs, because they are. Proper handling, packaging and storage methods are outlined within IPC-1601. Buy a copy today, no self-respecting CEM or OEM should be without it.
Most CEM/OEM houses have a PWB procurement document that is used to flow down specific requirements to their fabricators that may include exceptions to the general requirements listed in IPC 6012, IPC 2221, IPC 2222, etc. That document is the appropriate place to outline what you require for PWB handling.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of MaryJane Chism
Sent: Tuesday, December 10, 2013 11:21 AM
To: [log in to unmask]
Subject: [TN] Moisture Level Determination of PCB

Hi Group,

I have a question concerning the moisture level of a printed circuit board.

1) Does a printed circuit board have an MSL level? We have been treating the printed circuit as an MSL Level 3.
2) Should we consider the wave solder as a thermal event even though the wave carriers shield all areas of the printed circuit board except the specific through hole areas. We currently do but should we?

Any information you give will be helpful,

Thanks,

Mary Jane

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