Larry,
Because every new spec seems to have its own 'code' for specifying what you
want, we decided to forego the official descriptor format and just say what
we want;e.g., base material type GFG, copper foil type H, copper foil weight
layers 1 and 6, 1/2 oz/sq ft , layers 2 thru 5, 1 oz/sq ft;etc.   We also
try to further 'foolproof'' our communication to our board guys (you know
how board guys are) by diagramming the layer stack and labeling materials
and foil weights.  Oversimplification maybe, but hard to argue that we
weren't clear about what we wanted.

Oh yeah, just kidding about board guys.

Ralph Vaughan

> ----------
> From:         Larry Campbell[SMTP:[log in to unmask]]
> Reply To:     TechNet E-Mail Forum.;Larry Campbell
> Sent:         Wednesday, January 06, 1999 4:58 PM
> To:   [log in to unmask]
> Subject:      [TN] Material Callout
>
> With the new IPC-4101 spec out I'd like to get some feedback as to how
> others are calling out material for multilayer boards.  The example in the
> spec is great for a 2 layer board, specifying C1/C1, but how would you
> specify for greater than 2 layers?
>
> Granted, I've called out multilayer conditions in the past, I just want to
> see
> if there's a more generalized (ambiguous) way to do it.
>
> Larry Campbell
> BFGoodrich, Avionics Systems
>
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