Establishes the requirements for flexible base dielectric materials that are used in the fabrication of flexible printed circuitry and flexible flat cable. Provides comprehensive data that will help users more easily determine both material capability and compatibility. IPC-4202 includes flexible base dielectric material specification sheets which are identified by material type. IPC-4202 is closely aligned with IPC-4203 and IPC-4204. Supersedes IPC-FC-231C with Amendment 1 included and, in turn, IPC-FC-231C, IPC-FC-231B, IPC-FC-231A and IPC-FC-231. 32 pages. Released May 2002.