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.
Brassland machines C11000 into brass turned parts and CNC machined components to your drawing in Jamnagar, India, including precision turned brass components on 28+ Swiss-type lathes, with an EN 10204 3.1 certificate on every shipment.