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December 1998

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Subject:
From:
Andy Magee <[log in to unmask]>
Reply To:
Date:
Thu, 17 Dec 1998 22:13:29 -0500
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If your customer is asking for solder resistance then DuPont Pyralux is
rated for 550F. If they're looking for continuous operating temperature
than you're limited to 105C.

By the way, the Kapton dielectric film has far greater temperature
stability than the Pyralux acrylic adhesive. Unfortunately, the weakest
component typically controls the rated performance.

Be careful of the details involved with the end use application. Pyralux
goes through some pretty significant changes in Modulus during thermal
aging and if the application is counting on a particular stiffness to
work right they'll be disappointed over time. This reared it's ugly head
in a printer application a few years ago, and the answer was to switch
to more thermally stable materials. (Non-acrylic adhesive and Upilex
film)

Andy Magee
Flex Guru - Consulting
[log in to unmask]
(937) 435-3629

     Customer is asking for flex materials that have temperature rating
of
     300F-550F. Does Dupont Pyrallux Kapton go that high?
     Thanks.

     Teik M. Ng
     New Project Engineering
     Kalex Circuit Board (Guangzhou) Ltd.

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