Weight %. Lower Zn raises Cu content and improves corrosion resistance; Pb held low at ≤0.25%, meeting the NSF/ANSI 372 lead-free limit.
| Element | Symbol | Min % | Max % | Typical % |
|---|---|---|---|---|
| Copper | Cu | 62.0 | 64.0 | 63.0 |
| Zinc | Zn | Balance | ~36.5 | |
| Lead (max) ✓ | Pb | — | 0.25 | ≤0.20 |
| Iron | Fe | — | 0.30 | 0.05 |
| Property | Condition | Value | Unit |
|---|---|---|---|
| Tensile Strength (Rm) | H04 hard, typ | ~435 | MPa |
| Proof Stress (Rp0.2) | H04 hard, typ | ~325 | MPa |
| Elongation (A) | H04 hard, typ | ~25 | % |
| Hardness | H04 hard, typ | ~68 | HRB |
| Machinability | vs C36000 = 100 | ~70% | — |
| Density | — | 8.44 | g/cm³ |
| Thermal Conductivity | — | ~116 | W/(m·K) |
| Melting Point | liquidus | ~915 | °C |
| Standard | Designation |
|---|---|
| UNS (USA) | C27450 |
| EN | CuZn36 (low-Pb variant) |
| ASTM | C27000 (close, higher Pb) |
| Trade name | Low-Lead Yellow Brass |
C27450 is a low-lead CuZn36-type brass with lead held at or below 0.25% (meeting the NSF/ANSI 372 lead-free limit), rated around 70% machinability. 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 (78–80% 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 free-machining brass — closer to cartridge brass behaviour. Brassland machines C27450 routinely; send your drawing and we'll confirm cycle time and pricing within one business day.
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: 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.