Poor laminate, core, and prepreg selections together with poor relamination
process management. Again, check my article in SMT Express, with some pretty
ugly pictures, out next week - they tell me.

Earl
----- Original Message -----
From: Stephen R. Gregory <[log in to unmask]>
To: <[log in to unmask]>
Sent: Saturday, August 28, 1999 7:37 AM
Subject: [TN] Blisters or Delamination after Wave...


> Hi ya'll!
>
> Well, I'm in onna Saturday...(Months end, you know how that goes!). Just
> finished waving a small lot of boards (9 assemblies) and 5 of them came
off
> the wave with these dime to quarter-sized delaminated blisters, maybe 3-4
of
> them on each board, and the other 4 boards looked fine! What would cause
> that? Entrapped moisture? The boards were supposedly baked before wave (At
> least the traveler said they were). Any ideas?
>
> -Steve Gregory-
>
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