Weight %. Electrolytic tough pitch: minimum 99.90% Cu (Ag counted in), with controlled residual oxygen.
| Element | Symbol | Min % | Max % | Typical % |
|---|---|---|---|---|
| Copper (incl. Ag) | Cu | 99.90 | — | 99.95 |
| Oxygen | O | 0.01 | 0.05 | ~0.04 |
| Lead (max) | Pb | — | 0.005 | ≤0.003 |
| Total impurities | — | — | 0.10 | — |
| Property | Condition | Value | Unit |
|---|---|---|---|
| Tensile Strength (Rm) | soft → hard | 200–340 | MPa |
| Proof Stress (Rp0.2) | soft → hard | 70–280 | MPa |
| Elongation (A) | by temper | 6–45 | % |
| Electrical Conductivity | annealed | ≥100 | % IACS |
| Thermal Conductivity | — | 390 | W/(m·K) |
| Machinability | vs C36000 = 100 | ~20% | — |
| Density | — | 8.90 | g/cm³ |
| Melting Point | — | 1083 | °C |
| Standard | Designation |
|---|---|
| UNS / ASTM (USA) | C11000 — ASTM B152, B187 |
| EN (Europe) | CW004A / Cu-ETP |
| BS (UK legacy) | C101 / C102 |
| DIN (Germany) | Cu-ETP / E-Cu57 |
| JIS (Japan) | C1100 |
C11000 (Cu-ETP / CW004A) is electrolytic tough pitch copper, minimum 99.90% Cu, with 100% IACS electrical conductivity. It is the default material for busbars, terminals, transformer parts, grounding hardware and heat-exchanger components where conductivity matters more than strength.
Pure copper is gummy: it rates around 20% machinability against free-machining brass, with long stringy chips and built-up edge risk. Expect roughly 70% lower cutting speeds than CW614N, very sharp tooling and high-pressure coolant. Brassland machines C11000 terminals and contacts routinely on CNC and Swiss lathes.
Yes — C11000 is lead-free by composition, so it is RoHS compliant without exemptions, and its 100% IACS conductivity makes it the reference conductor material. Silver-plating or tin-plating can be added for contact surfaces.
Plate, sheet and bar are specified in ASTM B152, with the European equivalent designated CW004A (Cu-ETP) under EN standards. Brassland supplies parts with EN 10204 Type 3.1 mill certificates confirming purity and temper.
Busbars, terminals and contacts at 100% IACS, made to your drawing. ISO 9001:2015. Quote within 24 hours.
Request a QuoteComposition ranges, mechanical properties, machinability ratings and regulatory data on this page are cross-referenced against the publishers below. Tolerances and minimum values are taken from the relevant published standard at the time of writing — for procurement specification, always reference the current published edition.
Last reviewed: June 2026. EN/ISO/ASTM standards are updated periodically. This datasheet reflects the editions listed; for safety-critical or contract-critical applications, always verify against the current published edition of the standard. For project-specific deviations or supplier-specific composition windows, request a Type 3.1 mill certificate (EN 10204) with your order.