Eric,

 Congratulations! You have proved, once again, that water vapor is much more permeable than liquid water.

Try "soaking"  them in a high humidity condition (>90%) at 40 degrees C for 48 hours then running reflow.

David A. Douthit
Manager
LoCan LLC

Eric Dawson wrote:

> Werner,
> I could use some myself for internal quality training.
> I have recently soaked some BGAs and some quad packs in water for over a
> week before putting them through a reflow profile. I have yet to produce
> visible evidence of pop corning.
> The annoying thing is, a while ago we used some BGAs on a tape where the
> moisture indicator went just a little pink and they pop corned. The visual
> evidence was fat solder deposits and shorts in the middle of the package
> where it bowed downwards. My street cred. with the managers around here has
> taken a beating since I have failed to reproduce the problem.
> Oh well, I'd rather be happy than right.
> Regards
> Eric Dawson
>
> > -----Original Message-----
> > From: Werner Engelmaier [SMTP:[log in to unmask]]
> > Sent: Monday, November 18, 2002 4:02 PM
> > To:   [log in to unmask]
> > Subject:      [TN] Popcorning
> >
> > Hi 'Netters,
> > Could any of share some good pictures of a 'popcorned' component and a
> > component with delaminated die. I would of course give full credit as to
> > source.
> >
> > Thanks,
> > Werner Engelmaier
> >
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