so in essence what you are saying is too avoid partial planes?
Dennis Saputelli

Michael Reagan wrote:
> 
> >
> Brad wrote:
> > understand what your fab shops have told you. Both are layers with mostly
> > copper rather than mostly laminate, should be absolutely no difference
> > between the two if you designed it to be identical.
> >
> 
> Brad,
> 
> The key is you said "mostly".  It is my understanding that polygons on
> internal layers prevent the epoxies,glues to squish out uniformly when the
> laminates are pressed together, creating air pockets and voids therefore
> causing reduced reliability.  Don't get me wrong, I used to used them also
> until I had some designs rejected by some board houses.  I have several fab
> manuals that allow warn against using them.
> 
> Mike Reagan
> EDSI
> Frederick MD

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