Ralph,

The IPC has a comparison between IPC-4101 and MIL-S-13949, which was put together by
Doug Sober, IPC Base Materials Committee chair. Please contact me directly for an
electronic file of the comparison.

You might also be interested in a workshop the IPC is offering in September on this
issue: Base Materials and Laminates: Setting the Standard and Charting the Future.

The workshop is in two parts, with the first part educating people on how to make the
transition from MIL-S-13949 and its associated QPLs to IPC-4101. The following are
only a few of the many topics that will be covered.

The history of IPC-4101 development
Laminate and prepreg qualification
Quality conformance testing
IPC-1730 Laminator Qualification Profile
The flammability test method

The second half of the workshop will be on alternatives to FR-4, which will discuss
new base materials being developed to meet the demanding criteria of highly populated
boards and high density interconnect systems.

The following are the dates and cities where the workshops will be taking place.

Sept. 10 - Los Angeles
Sept. 11 - San Jose
Sept. 14 - Boston
Sept. 15 - Dallas
Sept. 16 - Minneapolis

For more information on these workshops, you can contact Maryellen Hildebrand at
(847) 509-9700, ext. 382, or e-mail [log in to unmask]

I hope that the above information answers your questions.

Best regards,


Chris Jorgensen
Project Manager
IPC
2215 Sanders Rd.
Northbrook, IL 60062-6135
-p- 847-509-9700 x.328
-f-  847-509-9798
[log in to unmask]
http://www.ipc.org
IPC/SMTA Electronics Assembly Expo
October 24 - 29, 1998
Rhode Island Convention Center
Providence, RI
www.ipc.org/html/assemexpo.htm


>>> "Vaughan, Ralph H" <[log in to unmask]> 07/31/98 08:06AM >>>
Hi Guys,

With the rapidly approaching death of Mil-S-13949 (Nov), it is presumed that
IPC-4101 will become the standard for PWB laminate materials.   If any
laminate suppliers or board fab folks have done a comparitive breakdown of
these two documents and slash sheets, it would sure save a lot of peoples a
lot of time. If not, maybe this could be an output of Steve's well
documented Dallas trip in Sept.

Thanx

Ralph Vaughan
Boeing-Atlanta
770 497-5222

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