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Does FPC have more calendered copper or electrolytic copper?
Less rolled copper, more electrolytic copper, reasons:

1. Calendered copper is expensive, and electrolytic copper is cheap.

2. At present, the bending properties of many electrolytic copper have caught up with those of calendered copper.

3. Many domestic FPC products do not need to be bent too many times, and electrolytic copper is enough.

For reference.