IPC 4204 A, “Flexible Metal-Clad Dielectrics for Use in Fabrication of Flexible Printed Circuitry,” has just been released. The new 53-page revision establishes the classification system, the qualification and quality performance requirements for flexible metal-clad dielectric materials to be used for the fabrication of flexible printed circuitry and flexible flat cable. It replaces the previous May 2002 edition of the standard (and IPC-FC-241C as well).
IPC 4204 includes 12 specification sheets that result from the combinations of various copper foil claddings; a polymer base dielectric selected from at least two polyesters, multiple polyimides or liquid crystal polymers; and at least seven versions of polymer adhesives as well as adhesiveless bonding agents. The net result of these material combinations provide the industry with suitable clad, flexible dielectrics for fabricating flexible printed circuitry interconnections.
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