Joe:

they are mutilayer polyimide P96 boards, from Isola.  they (the "Voids' )
are pervasive i.e. everywhere , the
laminate maker (Isola) swears that these are where the brominated compounds
are or were and thus are NOT voids. we are doing SEM now, butt it is
worrisome that if this is true then how good are the visual standards that
are suggested by IPC?


Thanks again.

Prasad Godavarti (Dr. G)
Principal Materials Engineer
Orbital Sciences Corp.
4808146238 (phone)




                      Joe Fjelstad
                      <[log in to unmask]        To:       [log in to unmask]
                      OM>                      cc:
                      Sent by: TechNet         Subject:  Re: [TN] Borminated Polymide
                      <[log in to unmask]>


                      08/29/2003 07:08
                      AM
                      Please respond to
                      "TechNet E-Mail
                      Forum."; Please
                      respond to
                      Joseph9000






Hello Prasad,

A quick couple of questions. Were these multilayer boards? (I am assuming
they are but have to ask) How pervasive are the voids and where were the
voids located? Are they in the core material or near the knit lines between
layers perhaps?

It may be that some organic contamination was entrapped during lamination
and that it volatilized during the high temperature lamination process
required for polyimide resins. Just a possibility...

Good luck,
Joe

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