Cu-ETP
CW004AElectrolytic Tough Pitch copper — the most widely used copper grade worldwide. 99.90% Cu min with controlled oxygen content (~0.02-0.04%). Electrical conductivity ≥100% IACS. Used for busbars, motor windings, transformer coils, electrical conductors, roofing, and radiators. Caution: hydrogen embrittlement risk in reducing atmospheres above 370°C.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | UNS | USA | UNS C11000 | C11000 | REF |
| 🇪🇺 | EN | Europe | Cu-ETP | CW004A | 100% |
| 🇬🇧 | BS | United Kingdom | C101 | — | 98% |
| 🇯🇵 | JIS | Japan | C1100 | — | 98% |
Sources: ASTM B152, EN 13601, BS 1172, JIS H3100
Chemical composition comparison (wt%)
Side-by-side: Cu-ETP (EN) (EN 13601) vs C101 (BS)
| Element | Cu-ETP (EN) | C101 (BS) | Overlap |
|---|---|---|---|
| Cu | ≥ 99.9% | — | — |
| O | 0–0.04% | — | — |
| Bi | 0–0.0005% | — | — |
| Pb | 0–0.005% | — | — |
Mechanical properties
Annealed
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 200–260 | MPa |
| Yield Strength | 40–80 | MPa |
| Elongation | ≥ 33 | % |
| Hardness HB | 40–65 | HB |
| Elastic Modulus | ≥ 117 | GPa |
| Density | ≥ 8.93 | g/cm3 |
Compatibility verdict
Cu-ETP and C101: 98% composition match
Close equivalents but NOT identical.
Related materials
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