Alex,

The manufacturers of these type poly bags use an amino-acid, which some have
eluded to as "Fatty substance" correctly. The amino acid was used as a release
agent to prevent the bags from sticking together from electrostatic attraction.
We researched the field and found other anti-static bags that did not contain
the amino-acids. I do not recall whose bags we ended up with and the one who
purchased these bags is no longer here. The pink bags did definitely affect the
solderability.

Les Connally
[log in to unmask]

>  From: Alex Neussendorfer <[log in to unmask]>, on 6/4/98 12:44 PM:
>  The pink bags are death on wire-bondable gold.  It's my understanding that
>  they contain a fat type substance.  Perhaps this is what you see.
>
>  ----------
>  > From: Mike Bailey <[log in to unmask]>
>  > To: [log in to unmask]
>  > Subject: [TN] Anti-Static Bags
>  > Date: Thursday, June 04, 1998 9:33 AM
>  >
>  > Has anyone experienced problems with packaging bare PCB's in the pink
>  > anti-static bags?  We are seeing a "waxy"image transfer from the bag to
>  > the panel after what appears to be several months of storage in a
>  > controlled atmosphere.  It is aggravated by stacking individually
>  > packaged boards on top of each other and has occurred on several
>  > different surface finishes. The substance can also be found on the
>  > non-board side of the bag.  Does anyone know of  what the coating might
>  > be comprised?  Would you predict solderability issues etc?
>  >
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