The CTE of:
Upilex S = 8 ppm/C
Kapton HN = 18 ppm/C
Kapton KN = 17 ppm/C
Apical AV = 21 ppm/C
Apical NP = 8 ppm/C
at temperatures less than 100C

The flex circuit material is typically a composite of polyimide film,
adhesive, and copper in varying ratios. The CTE of Copper is 17 ppm/C,
but the adhesive can exhibit a variety of CTEs depending on the
formulation and temperature. To estimate a CTE for your particular
composite flex structure you can use the flex analysis software I
developed for Rogers some years back available at:

http://www.geocities.com/CapeCanaveral/Launchpad/9641/program/program.html
or at
http://www.rogers-corp.com/cmu/software.htm

Andy Magee - Flex Guru
Senior Consultant, Bourton Group
[log in to unmask]
(937) 435-3629

Brett wrote,

Does anyone know the CTE (coefficient of thermal expansion) of
Upilex-S and Kapton flex circuit material?  I have data sheets from
Rogers, but they don't list CTE values.

Thanks for the help!

Brett Goldstein
EVI, Inc.

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