Mr. Moon, Mr. Brummer, and all,

It appears that since we did not spec out the construction, our supplier
decided to provide us with the cheapest way, unbeknownst to us.  We are
a small shop without a lot of engineering support.  We typically rely on
our suppliers to steer us in the right direction.  All our lay-ups are
conservative and on the high resin side.  Former purchasing people here
put their trust 100% with the supplier to provide an equally
conservative construction.  It appears that that did not happen.  The
more I know, the more I need to know.  Tough lesson learned.

Thanks for the input.

Anne

> -----Original Message-----
> From: Enter your name here [SMTP:[log in to unmask]]
> Sent: Tuesday, August 17, 1999 7:40 PM
> To:   TechNet E-Mail Forum.; Anne Ledger
> Subject:      Re:      [TN] Innerlayer issue
>
> Are you talking about weave impressions left from low resin to glass
> ratio
> materials? If you are, the answer is get away from using that nasty
> old
> 7628/7629 material facing foil. Go resin rich for no weave impressions
> and
> better innerlaminar bond strength with better resist adherence.
>
> Earl Moon
> ----- Original Message -----
> From: Anne Ledger <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Tuesday, August 17, 1999 5:45 AM
> Subject: [TN] Innerlayer issue
>
>
> > Good Morning Technetters,
> >
> > I have a question for board fabbers.  Problem:  We are experiencing
> > weave texture on our innerlayer material.  I have spoken to the
> > manufacturer who states that weave does shift in the "pour" of the
> > material (when the resin is added) and that there is no
> specification
> > that controls the depth requirement of the weave.  The topography is
> > visual prior to lam/image.  The condition is causing our resist to
> lift
> > slightly and allows an etch stain on the double treat foil that so
> far
> > we can not remove.  Question:  Is this a typical condition of
> innerlayer
> > material (other manufacturers)?  Is it double treat foil only?  Is
> there
> > a way to remove this type of etch stain?  What is the acceptablity
> of
> > stain on inner layer foil?  I can't find any reference info in IPC.
> >
> > Any and all input would be appreciated.
> >
> > Anne Ledger
> > EMDS, Inc.
> >
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