In a message dated 12/02/1999 1:58:55 PM US Eastern Standard Time,
[log in to unmask] writes:

>
>  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.

I suspect that the boards are placed in the bags while either still tacky or
straight out of the oven (still warm).  Silicones would be "impressable" at
that point.

Doug Pauls
CSL

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