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October 2005

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From:
Arnaud GRIVON <[log in to unmask]>
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Date:
Tue, 4 Oct 2005 17:21:07 +0200
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Werner Engelmaier a écrit :

>Hi Arnaud,
>You did not say whether this is rolled or ED copper. Also, the way you
>described it, you may have a stres concentration geometry.
>You will have a problem with correlating Vickers hardess to ductility,
>particularly since ductility is directional and vickers is not. However, you should
>be able to determine whether there is something different with the failure
>location copper.
>
>
>
>Werner
>
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>
Werner,

To answer your question, the flex structure is based on a double sided 
50µm polyimide without adhesive (35µm RA copper).
Each side of this core has a 50µm acrylic adhesive layer and a 25µm 
coverlay.

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