While copper is the most common metal used in PCB foils, the standard also covers:
Ask your vendors for their own internal validation data against IPC-4562. Many suppliers will provide a summary matrix showing exactly which tests are performed per lot. ipc-4562 pdf
IPC standards are living documents that are revised approximately every five to seven years. The metallic foils task group (3‑12a) continues to meet, often by teleconference and at IPC working group weeks. While copper is the most common metal used
The standard explicitly restricts its application to . This includes foils that will be bonded to insulating substrates (e.g., FR‑4) and subsequently etched to form circuit patterns. ipc-4562 pdf