Weight %. At ~40% Zn the beta phase appears — harder and stiffer cold, but superbly workable hot.
| Element | Symbol | Min % | Max % |
|---|---|---|---|
| Copper | Cu | 59.0 | 61.5 |
| Zinc | Zn | Balance | |
| Lead (max) ✓ | Pb | — | 0.20 |
| Iron | Fe | — | 0.20 |
Bars show the range from the table: bar length at mid-range, zinc as the remainder.
EN 12164 condition values (minimum values). Condition names give the minimum tensile strength; hardness conditions (H…) are an alternative way to order. The EN 10204 3.1 certificate reports the values of the supplied bar. Physical properties are typical values; a range shows the spread of published data (reference: Copper Development Association, UNS equivalent C28000).
| Property | Condition | Value | Unit |
|---|---|---|---|
| Condition M | as manufactured | no limits | — |
| Tensile / Elongation | R360, Ø6–80 mm | ≥360 / ≥20 | MPa / % |
| Tensile / 0.2 % Proof | R410, Ø2–40 mm | ≥410 / ≥230 | MPa / MPa |
| Tensile / 0.2 % Proof / Elongation | R500, Ø2–14 mm | ≥500 / ≥350 / ≥8 | MPa / MPa / % |
| Hardness | hardness conditions H070 / H100 / H120 | 70–100 / 100–145 / ≥120 | HB |
| Density | at 20 °C | 8.39–8.41 | g/cm³ |
| Melting Range | solidus–liquidus | 880–910 | °C |
| Thermal Conductivity | at 20 °C | 117–123 | W/(m·K) |
| Electrical Conductivity | at 20 °C | 26–28 | %IACS |
| Thermal Expansion | 20–300 °C | 20.3–20.9 | ×10⁻⁶/K |
| Modulus of Elasticity | at 20 °C | 102–103 | GPa |
| Machinability | CDA rating of its UNS equivalent C28000 (C36000 = 100) | 40 | index |
| Standard | Designation |
|---|---|
| EN (Europe) | CuZn40 / CW509L |
| ASTM (USA) | C28000 (Muntz Metal) |
| BS (UK legacy) | CZ109 |
| DIN (Germany) | CuZn40 / Ms60 |
| JIS (Japan) | C2801 |
CuZn40 (CW509L) is a 60/40 copper-zinc brass with an alpha-beta duplex structure. The beta phase makes it excellent for hot working — extrusion, hot rolling and forging — which is why it is used for architectural extrusions, condenser plates and tubes, hot forgings and large nuts and bolts.
Yes, with one condition. No lead is added to CuZn40, but the EN standards allow up to 0.2% Pb as an impurity, and the RoHS threshold is 0.1%. Heats with Pb ≤0.10% are compliant without Exemption 6(c); above that the alloy relies on 6(c) like any other copper alloy. Specify Pb ≤0.10% on the order if you need exemption-free material.
They are opposites: CuZn37's all-alpha structure excels at cold forming, while CuZn40's duplex structure prefers hot working and is harder and stiffer cold. Pick CuZn37 for deep drawing at room temperature; pick CuZn40 for hot-extruded or hot-rolled shapes (machinability about 40%).
Rod and profiles are specified in EN 12167 (designation CW509L). The traditional US equivalent is C28000 Muntz Metal, former UK designation CZ109. Brassland supplies EN 10204 Type 3.1 mill certificates with every lot.
Write the standard and designation together, for example “CuZn40 / CW509L”. The table above gives values by condition (annealed, half-hard); 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.
CuZn40 / CW509L. The UNS equivalent is C28000 (Muntz Metal).Primary source: Copper Development Association — C28000 (UNS equivalent).
Hot-worked and machined 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 CuZn40 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.