Establishes the requirements for metal-clad dielectric film materials used in flexible printed circuitry fabrication and flexible flat cable. Provides comprehensive data that will more easily help users determine both material capability and compatibility. IPC-4204 includes the metal-clad dielectric film material specification sheets which are identified by material type. Closely aligned with IPC-4202 and IPC-4203. Supersedes IPC-FC-241C and, in turn, IPC-FC-241B, IPC-FC-241A and IPC-FC-241. 57 pages. Released May 2002