(Note: I assumed IPC-4562 is a standards-style technical document based on the naming; if you meant a different IPC-4562, specify context and I’ll adapt.)
For any new product design involving flat flexible cable (FFC) or flexible printed circuits (FPC), your procurement team specify IPC-4562 rather than the obsolete MF-150. ipc-4562 pdf
The standard covers both metal foils supported by carrier films and unsupported foils. It provides a unified system for designating foil types, quality classes, and performance requirements to ensure consistency between material suppliers and PCB fabricators. It supersedes older standards like IPC-MF-150 and IPC-CF-150. ANSI Webstore 2. Key Classification Systems (Note: I assumed IPC-4562 is a standards-style technical
Without invoking IPC-4562 in your supply chain, you have no contractual or technical basis to reject the foil. Your legal liability multiplies. It supersedes older standards like IPC-MF-150 and IPC-CF-150
: Used for procuring foils that will eventually become the conductive layers of rigid, flexible, and rigid-flex PCBs. 2. The IPC-4562 Designation System