Weight %. Electrolytic tough pitch: minimum 99.90% Cu (Ag counted in), with controlled residual oxygen.
| Element | Symbol | Min % | Max % |
|---|---|---|---|
| Copper (incl. Ag) | Cu | 99.90 | — |
| Lead (max, EN CW004A) | Pb | — | 0.005 |
| Total impurities | — | — | 0.10 |
Bars show the range from the table: bar length at mid-range, zinc as the remainder.
Typical rod values by section size and cold work — strength falls as the section grows. The mill certificate reports the values of the supplied rod.
| Property | Condition | Value | Unit |
|---|---|---|---|
| Tensile / Yield (0.5 % ext.) / Elongation | rod OS050 (annealed), 1 in (25 mm) | ~221 / ~69 / ~55 | MPa / MPa / % |
| Tensile / Yield (0.5 % ext.) / Elongation | rod H04 (hard), 1 in (25 mm), 35 % cold work | ~331 / ~303 / ~16 | MPa / MPa / % |
| Tensile / Yield (0.5 % ext.) / Elongation | rod H04, 0.25 in (6 mm), 40 % cold work | ~379 / ~345 / ~10 | MPa / MPa / % |
| Electrical Conductivity | at 20 °C (annealed ≥100) | 101 | %IACS |
| Thermal Conductivity | at 20 °C | 391 | W/(m·K) |
| Density | at 20 °C | 8.91 | g/cm³ |
| Melting Range | solidus–liquidus | 1065–1083 | °C |
| Modulus of Elasticity | CDA | 117 | GPa |
| Machinability | CDA rating (C36000 = 100) | 20 | index |
| Standard | Designation |
|---|---|
| UNS / ASTM (USA) | C11000 — ASTM B152, B187 |
| EN (Europe) | CW004A / Cu-ETP |
| BS (UK legacy) | C101 |
| 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 much lower cutting speeds than for 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.
Write the standard and designation together, for example “ASTM B187 – C11000”. The table above gives values by condition (soft, hard, annealed); state the condition or a minimum property on the drawing when it matters. Tolerances follow ISO 2768-m unless the title block says otherwise.
The mill’s EN 10204 Type 3.1 inspection certificate for the alloy lot reports the measured chemical composition and mechanical test results. Brassland adds a Certificate of Conformity for the order and RoHS and REACH declarations at no charge; PPAP Level 1–3 packages are available for OEM qualification.
ASTM B187 – C11000. The EN equivalent is CW004A / Cu-ETP.Primary source: Copper Development Association C11000.
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: September 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.