I have never seen anything quite like this... the image does raise some questions, however:

*         What is the age of the flex section depicted. Is this new product, or a field failure?

*         What kind of thermal and vibe history has the flex seen?

*         What is the thickness of the flex section, and how many layers are present?

*         Is the source of the fine surface scratches running roughly horizontally in the imge known?









-----Original Message-----
From: IPC-600-6012 [mailto:[log in to unmask]] On Behalf Of Hammill, Vicka (EHCOE)
Sent: Wednesday, October 28, 2015 10:56
To: [log in to unmask]
Subject: [IPC-600-6012] Flex quesstion



Has anyone ever seen this condition of cracking of the Kapton on a flexible part of a  rigid flex?   If so, do you the cause?   We have done crossections on this and it showed the kapton only cracking...the adhesive was not cracked and remained untouched.  So far, we have found no specific reason for the cause.

Any input would be appreciated.









Vicka Hammill

Staff Engineer/PB CAA



Honeywell

Lync Phone: 480-627-5547

FAX: 602-436-1005

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