Electrostatic fields can be induced in high dielectrics and once there, may 
be hard to get rid of. As little as 50 VDC can be a problem for IC chips 
without enough I/O diode protections. We have had some issues which might 
have been caused by such surface charges, but we could never prove it. To be 
sure , we demand ESD safe bags. Additional cost negligible.
Inge

----- Original Message ----- 
From: "John Parsons" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, May 14, 2009 8:36 PM
Subject: [TN] Bare PCB Packaging Requirements


> Tell us, how many CEM's out there are demanding that bare PCB's be 
> received
> in vacuum sealed moisture barrier anti-static bags.  If so, what is your
> reasoning?  Just to be clear my focus here is "anti-static" not the 
> moisture
> barrier properties of the packaging.
>
>
>
> Regards
>
>
>
> John Parsons
>
>
>
>
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