Hi Jim,
Actually, IPC-2223 does not have the design guidelines for a flex circuit for
continued flexing; for that you need to go to IPC-D-330, Section 6.2.1.2
"Flexibility Considerations in the Design of Flexible Printed Wiring." Also,
IPC-TP-652 and IPC-TR-484 would be good references.
Factors that need to be considered are bend radius, distance from neutral
plane, ductility, tensile strength, modulus of elasticity.

Werner Engelmaier

---------------------------------------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
Please visit IPC web site http://www.ipc.org/html/forum.htm for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------