Pink bags of the type used for static protection may be gaining their charge disipative
properties by being impregnated with an amine type compound. This bleeds to the surface
and attracts moisture from the air forming an ionic/conductive layer. This stuff could
quite handily react with your boards and will also effect conductivity solderability and
so on as mentioned in another strand of this thread.

I say "might be" because not all pink bags work this way, check with your supplier, but
the cheaper ones certainly do. These things are better for protection of paperwork and
stuff like that in a static controlled environment than PCBs (IMHO).

Mike Fenner

----- Original Message -----
From: Jean-Francois Bissonnette <[log in to unmask]>
To: <[log in to unmask]>
Sent: 02 December 1999 19:00
Subject: Re: [TN] Bagging Requirements


> Hi!
>
> We've been having an interesting problem concerning packaging.
> We ask for the use of silicon conformal coating on our boards
> and every time we received them, we could clearly see the marks
> left by the pink packaging.  Since their were packed tighthly,
> it seems like the packaging would embed into the coating.  Even
> if we used sheilding bag we would still end up with problems, the
> bag would stick to the board and traces or coating could be found
> in the bag using UV light.  The boards were fully cured.
>
> Anyone had the problem before and know what to do about it?
>
> J-F
>
>
> > -----Original Message-----
> > From: TechNet [mailto:[log in to unmask]]On Behalf Of Anne Ledger
> > Sent: Thursday, December 02, 1999 8:23 AM
> > To: [log in to unmask]
> > Subject: [TN] Bagging Requirements
> >
> >
> > Good Morning Technet,
> >
> > I have a question for the board fabrication group.  We are tasked with
> > many different requests with regard
> > to "bagging" of boards for shipment.  Some customers require individual
> > bag and seal, some want anti-static bags, etc.,
> > the vast majority of customers do not call out any spec for bagging.  If
> > no spec is issued, is it fair to default to
> > the IPC-130?  Is 130 still viable?  Looking for some ideas of what the
> > rest of you are doing?
> >
> > Thanks in advance.
> >
> > Anne Ledger
> > EMDS, Inc.
> > [log in to unmask]

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