Mass %, Copper Development Association: copper plus the named elements at least 99.5 %. Lead up to 0.25 % keeps the material within the NSF/ANSI 372 lead limit.
| Element | Symbol | Min % | Max % |
|---|---|---|---|
| Copper | Cu | 60.0 | 65.0 |
| Zinc | Zn | Balance | |
| Lead (max) ✓ | Pb | — | 0.25 |
| Iron | Fe | — | 0.35 |
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 / 0.2 % Proof / Elongation | rod H04 (hard) — typical | ~434 / ~324 / ~25 | MPa / MPa / % |
| Hardness | rod H04 (hard) — typical | ~68 | HRB |
| Machinability | CDA rating (C36000 = 100) | 70 | index |
| Hot Forgeability | CDA rating (C37700 = 100) | 95 | index |
| Density | at 20 °C | 8.44 | g/cm³ |
| Electrical Conductivity | at 20 °C | 27 | %IACS |
| Thermal Conductivity | at 20 °C | 116 | W/(m·K) |
| Thermal Expansion | CDA, 20–300 °C | 20.5 | ×10⁻⁶/K |
| Melting Point | liquidus | 916 | °C |
| Modulus of Elasticity | CDA | 103 | GPa |
| Standard | Designation |
|---|---|
| UNS (USA) | C27450 |
| EN — overlapping | CW507L / CuZn36 (Cu 63.5–65.5) · CW509L / CuZn40 (Cu 59.0–61.5) — no single EN equivalent |
| UNS — related | C27000 yellow brass 65 % (Cu 63.0–68.5, Pb ≤0.09 — lower lead) |
| Trade name | Low-Lead Yellow Brass |
C27450 is a low-lead yellow brass — 60–65% copper with lead held at or below 0.25% (meeting the NSF/ANSI 372 lead limit) — rated around 70% on the CDA machinability scale. It offers good corrosion resistance and is used for low-lead plumbing fittings, gas components and machined parts.
Yes. As a copper alloy it is RoHS-compliant under Exemption 6(c), which permits up to 4% lead; with lead at or below 0.25% it also meets the NSF/ANSI 372 lead-free limit for potable-water wetted parts.
C27450 is the economical lead-free choice for general parts; silicon brasses machine better (about 85% vs ~70%) and add intrinsic dezincification resistance for potable water. If the part is water-wetted or heavily machined, the silicon grades usually justify their premium.
Plan for lower speeds and longer chips than with free-machining brass. Brassland machines C27450 routinely; send your drawing and we'll confirm cycle time and pricing within one business day.
Write the standard and designation together, for example “C27450 – H04”. State it whenever a minimum tensile strength or hardness matters — the table above lists the values per temper (H04). 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.
C27450 – H04. The EN equivalent is CuZn36 (low-Pb variant).Primary source: Copper Development Association C27450.
Low-lead brass, RoHS compliant via Exemption 6(c). 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 C27450 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.