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March 1999

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Subject:
From:
KELLY M SCHRIVER <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 18 Mar 1999 16:35:00 -0500
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Eldon -

MIL-P-13949 and its successor, MIL-S-13949 were both laminate specifications
for a wide variety of epoxy, polyimide, aramid and other materials.  They
covered clad, unclad and B-staged materials.  These materials included FR-4
and many other grades of laminate.  MIL-S-13949 was cancelled in November
1998.  This means the laminate suppliers, for the most part are no longer
supplying materials certified to that document.  If you don't require
certification, the laminates can still be procured, or they can be procured
under another specification, such as IPC-4101

Recommend you solicit your customers approval to convert to an equivalent
grade of laminate material under IPC-4101.  This document contains a handy
conversion list on page 19, or most laminate suppliers are willing to assist
in the process.

Regards - Kelly

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