Dave,
There are notations on the specifications that the latest IPC specs.
supercede the old FC specs. There's a paper/document trail. That should be
all they need.
Dan S.
----- Original Message ----- 
From: "Dave Connitt" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, June 22, 2009 2:39 PM
Subject: [TN] Flex circuit specifications


Hello,
We have some flex circuits that were designed to the older IPC-FC
specifications and our fabricator is asking us to update our drawings to
replace the older specifications with the newer ones. To implement this,
we in turn have to ask our customers for permission to change the
drawings. In order to do that, we need to get a idea about what was
changed or reorganized when the specification was changed.
Can anyone give me the two sentence explanation regarding these
specifications?

Old Specification    New Specification
IPC-FC-231            IPC-4202    Flexible Dieletrics for use in
Flexible Printed Wiring
IPC-FC-232            IPC-4203    Specification for adhesive-coated
dielectric film for use as cover sheets  for Flexible Printed Wiring
IPC-FC-241            IPC-4204    Flexible metal clad dielectrics for
use in fabrication of Flexible Printed Wiring

Thanks,
Dave Connitt CID+
Printed Circuit Designer
L3 Fuzing & Ordnance Systems
A Wholly Owned Subsidiary of:
L3 Communications
3975 McMann Road
Cincinnati, Ohio 45245
Ph. 513- 943-2010   Fax 513-943-2288

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