Frank,
        I am quite sure that both Mark and I both understood that. I (we?)
were wondering why they were not included in the IPC tables as a significant
piece of information when the materials quoted have such varying weaves and
resin contents. If significantly mismatched X/Y CTEs were mixed in a
stackup, it would contribute negatively to the board bow and twist.

Brad Velander,
Lead PCB Designer,
Norsat International Inc.,
#300 - 4401 Still Creek Dr.,
Burnaby, B.C., V5C 6G9.
Tel. (604) 292-9089 direct
Fax (604) 292-9010
website www.norsat.com


> -----Original Message-----
> From: Frank Gilley [mailto:[EMAIL PROTECTED]]
> Sent: Monday, July 09, 2001 11:35 AM
> To: Protel EDA Forum
> Subject: Re: [PEDA] Layer Stackup Info.
> 
> 
> Brad & Mark
> 
> X&Y CTE are Coefficient of Thermal Expansion, X and Y directions.
> 
> -Frank
> 

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