# Copper foil

Part ID: 4.06a · Layer 4 (Servers, racks & integration) · child of 4.06

The rolled or electrodeposited copper foil bonded to laminate cores that forms the actual conductive layers inside a PCB.

## Companies

| Company | Role | Confidence | Ownership | Ticker | Note |
|---|---|---|---|---|---|
| Furukawa | manufacturer | inferred | public | 5801.T |  |
| Mitsui Kinzoku | manufacturer | inferred | public | 5706.T |  |
| Chang Chun | manufacturer | inferred | private |  |  |

Confidence tags: disclosed = company/filing statement; reported = trade press or partner list; inferred = taxonomy lead.