Here's the Dk of several polyimide films for flex circuits:

Kapton HN 3.4
Apical AV 3.4
Kapton KN 3.6
Apical NP 3.4
Upilex S  3.5
Flex-I-Mid 3.2


Keep in mind that the Dielectric Constant changes with frequency, 
temperature and moisture content for many materials. 

We also have a range of high frequency materials with various 
engineered Dk's listed on our Website at:
http//www.rogers-corp.com/mwu


     
     Andy Magee - Applications Engineer
     Rogers - Circuit Materials
     Tel: (602) 917-5237
     Fax: (602) 917-5256
     E-Mail: [log in to unmask]
     Website: http//www.rogers-corp.com/cmu
     
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______________________________ Forward Header
__________________________________
Subject: Re: dielectrics for dif materials
Author:  No Name::(NAMEN) at ~FABRIK
Date:    1/22/97 6:43 PM


From: No Name
Date: Wed, Jan 22, 1997 6:43 PM
Subject: Re: dielectrics for dif materials 
To: asaldana; Magee, Andrew P
Dielectric Values
FR-4 = 4.8
teflon = 2.4
Polyimide = 4.3
GETAK = 3.9
     
     
     
On Wed, 22 Jan 1997, Armando Saldana wrote:
     
> attn: all in the TechNet Forum!!
>
> Can anybody out there tell me how I can 
> get the dielectric values for different 
> kinds of materials?
>
> FR4 = ?
> Polyimide = ?
> Teflon = ?
> Kapton = ?
> etc. = ?
>
> can i call a website or would ipc have this kind of 
> information handy at all times?
>
> i need this info yesterday so anybody with 
> any kind of help or hints would be greatly 
> appreciated!!
>
> thanks in advance!
>
>
> Armando Saldana
> [log in to unmask]
>
---------------------------- Forwarded with Changes ---------------------------
From: No Name::(NAMEN) at ~FABRIK
Date: 1/22/97 6:43PM -0800
To: Andrew P Magee at Rogers-MCD
*To: ASALDN at ~FABRIK
Subject: Re: dielectrics for dif materials
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