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From: Carey Ritchey/KENT/COM/AUGAT
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Date:  2 Oct 96 17:38:44 
Subject: RO40003 and RO4350
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Has anyone built a 4 layer mulitlayer PCB utilizing  Rogers RO4003/4350 
materials for two layers and 
FR4 for the other 2 
Questions :  what type of stack up did you use
  we are imagining  0.020 RO double side material FR4 prepreg and 0.020 FR4 
double side
  for a finished of aprox 0.062

What happens to flammability rating if you hybrid 94VO rated FR4 with non
rated 
RO4003
Can we still expect UL approval if we utilize FR4 and RO4350 which is 94VO
rated

Also what sort of cost saving is to be expected by utilizing FR4 for the non

critical layers.


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======== Fwd by: Tony King / N ========
I have processed panels of this construction, though test designs only since
I do not have UL approval for RO4003 in a mixed construction (and Rogers did
not have UL on RO4003 at the time).  I would be happy to discuss the
experience with you in specifics.  Over all though, the build was very
successful.  No manufacturing problems encountered, actually some
improvements were noted as result of this mix.

Please call to discuss in more detail.

Tony King
Elexsys International Inc.
Nashua  N.H.
Phone: 603-886-0066
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