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April 2002

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Subject:
From:
Earl Moon <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 26 Apr 2002 14:51:28 -0500
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Terri,

Don't mean to barge in like this but in the "good old" days of wine, roses,
and the MX missile system as line was drawn in the sand, or rigid flex as it
was. The MX never flew because it had a total of 79 layers of rigid flex
circuitry. One supporting board had 22 layers and continually failed.

It delaminated in several ways and areas. TMA analysis revealed delamination
way below expectations due to the acrylic adhesive used then. Later, after
the program was scrapped, folks like Marty Jawitz (anyone remember Marty) at
Litton Guidance Systems came up with a requirement limiting all rigid flex
designs to 11 layers.

Have some pretty ugly pictures from that era. Probably you and others have
answers overcoming the adhesive problem, cold flowing at room temperature
(Tg of about 70 or so F.). Sure like to get updated on what those answers
might be.

MoonMan

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