I'd like to know if there is a minimum dielectric thickness requirement for 
flexes similar to the requirement for rigid boards in IPC-D-275?  I've been 
looking through some of the flex specs (IPC-D-249, IPC-FC-231, IPC-FC-250) 
and haven't found anything that specifies a minimum.  I would appretiate any 
help in locating this information, if there is any.

Thank you,

Larry Campbell
BFGoodrich, Avionics Systems
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