Good Morning Dave

Per IPC-A-600F page 11 is  Acceptable Class 1,2,3, spacing between conductors meets minimum conductor spacing requirement.
Per IPC-A-610C Page 10-8 Acceptable Class 1,2,3, the weave does not reduce the spacing between conductive patterns.

Weave Exposure is Acceptable.   for Class 1,2,3, Just watch your conductive spacing you can find a Table in IPC 610C on page A-1. If you violate the clearance then it is a defect.

Have a good day.
Nancy T.

>>> [log in to unmask] 01/12/01 02:29PM >>>
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.


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