Pls read Werner Engelmeier white paper for PCBs spec.
On Tue, Dec 10, 2013 at 8:50 PM, Stadem, Richard D. <
[log in to unmask]> wrote:
> 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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