As a general rule the adhesiveless costs about 2X the adhesive types.
There are many adhesiveless versions available and they all have pluses
and minuses. You can buy copper fused into the base material, sputtered
on copper over a seed layer or material which is made by putting liquid
material onto the metal. For your application a normal adhesive material
should suffice.
Regards Steve Kelly

PFC Flexible Circuits Limited

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Roger Stoops
Sent: Tuesday, April 22, 2003 4:26 PM
To: [log in to unmask]
Subject: [TN] Cost Comparison of Flex Circuit Mat'l

Dear all,

  I guess there are two basic types of Cu-clad polyimide: Cu-clad
polyimide with adhesive and adhesiveless Cu-clad polyimide.  I am
curious as to the relative cost of each, and the advantages or
limitations of using either one.  The end use is Class 2, Type 5A (flex
to install), in a (fairly) sealed enclosure that will see temps of -20C
to +85C.  Only two copper layers, no plated holes.

  In the past our FPCs have always been of the Cu-adhesive-polyimide
type.  I want to know if there would be any advantage to using the
adhesiveless stuff, besides thinner circuits.

Cordially,

Roger M. Stoops, CID
Trimble Navigation Ltd., Dayton, OH, USA
Ph: 937.233.8921  or  937.233.4574  ext 288
Fax: 937.233.7511

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