Peel strengths for PTFE on Woven E-glass, Non-Woven E-glass, and ceramic 
filled materials are covered in IPC-L-125A, "Specificaiton for Plastic 
Substrates Clad or Unclad for High Speed/High Frequency 
Interconnections".  This document does a better job in establishing the 
requirements for PTFE materials than MIL-S-13949 does.

Peel strength requirements have been established for after thermal stress 
and after exposure to elevated temperature.

IPC-L-125A sells for $15 to member companies and $30 to non members.  You 
can contact our order department on X318

Regards
***************************************************
David W. Bergman, Director of Technical Programs
IPC
7380 N. Lincoln Avenue
Lincolnwood, IL  60646
708-677-2850 x340 Phone
708-677-9570 Fax
email  [log in to unmask]
***************************************************


On Mon, 26 Jun 1995 [log in to unmask] wrote:

> I am looking for recommendations of what the conductor peel strength in lbs/in
> should be when tested per MIL-S-13949 for Teflon type PWB material.  I am
> particularly interested in Rogers RT/duroid in the 6000 and 3000 series and
> Arlon AR1000 and CLTE.  I need the data to apply to the fabricated board.
> 
> If you have any information, please send to:
> 
> Lewis Burnett
> Honeywell
> phone:  602-436-4744
> e-mail:   [log in to unmask]
> 
>