Revision C of the IPC-A-610 states:

Acceptable - Class 1,2,3
Weave exposure does not reduce the spacing between conductive patters below
speification minimums.

Remember the adage Form, Fit and Function. I think this is likely a
non-issue.


 Guy Ramsey
American Competitiveness Institute
Senior Lab Technician / Instructor
610 362-1200 ext 107


-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Dave Kell
Sent: Friday, January 12, 2001 2:30 PM
To: [log in to unmask]
Subject: [TN] Flex-circuit Stiffeners


I have a customer for a high rel application that is concerned about weave
exposure on a epoxy glass stiffener.

According to IPC-610, weave exposure is not acceptable.  Our material
supplier sands the material in order to meet tight thickness tolerances.
Per IPC-6013, stiffeners are to be evaluated only for mechanical support. In
addition, the circuit as supplied is allowed weave exposure if conductor
spacing is not reduced below minimum. Since a stiffener carries no
conductors, I would consider this a non-issue.

Any words of wisdom from manufacturers or assemblers welcome.

Dave Kell
Minco Products, Inc.


PLEASE NOTE: Our area code has changed
from 612 to 763.

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