Boards are not always shipped in vacuum packs. Shelf life depends on many
variables, not the least of which are temperature and humidity. Surface
finish, flux activity level, substrate material, layer count, process method
(hand solder vrs mass reflow) . . .

A short answer is 6 months to a year for solderabitliy, bakeout maybe
advisable under some conditions to prevent failure in the board laminate.

A shorter answer is we need more information.

> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Cathy Killen
> Sent: Monday, October 29, 2001 7:52 AM
> To: [log in to unmask]
> Subject: [TN] Vacuum Packaging
>
>
> Hi all,
> How long can you keep bare PCBs after they have been removed from their
> original vacuum sealed packaging?
>
> Thanks in advance.
>
> Cathy Killen
> Training Instructor
> Smtek Europe Ltd.
>

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