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Testing
Four numbers decide whether copper-clad steel performs: conductivity, cladding thickness, adhesion, and diameter.
Per lot
| Property | Method | Result reported | Where |
|---|---|---|---|
| Conductivity | Four-terminal resistance | % IACS for the lot | Certificate value |
| Cladding thickness | Cross-section measurement | Per side, not average only | Certificate value |
| Concentricity | Cross-section measurement | Eccentricity stated | Certificate value |
| Adhesion | Bend and torsion | Pass or fail | Report |
On every metre
| Property | Method | Resolution |
|---|---|---|
| Diameter | In-line laser micrometer | 0.001 mm |
| Ovality | In-line measurement | Stated |
| Surface | Visual and eddy current | Full length |
Why adhesion is tested rather than assumed
A cladding that has bonded at the surface but not metallurgically will pass a visual check and then delaminate when the wire is bent on site or compressed in a connector. The bend and torsion test is the cheap way to find that before shipment instead of after installation.