Flexible Metal-Clad Dielectrics for Use in Fabrication of Flexible Printed Circuitry

IPC-4204 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 boards. It includes specification sheets that result from the combinations of various copper foil claddings; a polymer base dielectric selected from polyesters, polyimides, liquid crystal polymers and at least nine versions of polymer adhesives as well as adhesiveless bonding agents.

Recommended Drawing Call-Outs

  • Specifying a slash sheet from this specification is the best way to designate the right material to be used 
  • Specifying a starting copper weight for external layers and following IPC-6013 minimum plating thickness table is best method to ensure finished copper thickness requirements are met 
  • Refrain from specifying laminate or prepreg by brand name, Tg, or Td