Weight %. Lower Zn (35–37%) raises Cu content and improves corrosion resistance; Pb strictly held at ≤0.09%.
| Element | Symbol | Min % | Max % | Typical % |
|---|---|---|---|---|
| Copper | Cu | 62.0 | 64.0 | 63.0 |
| Zinc | Zn | Balance | ~36.5 | |
| Lead (max) ✓ | Pb | — | 0.09 | ≤0.05 |
| Iron | Fe | — | 0.30 | 0.05 |
| Property | Condition | Value | Unit |
|---|---|---|---|
| Tensile Strength (Rm) | typical | 370–480 | MPa |
| Proof Stress (Rp0.2) | typical | ≥150 | MPa |
| Elongation (A) | typical | ≥22 | % |
| Hardness | typical | 90–115 | HB |
| Machinability | vs C36000 = 100 | ~55% | — |
| Density | — | 8.52 | g/cm³ |
| Melting Range | solidus–liquidus | 905–935 | °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 0.09%, rated around 55% machinability. It offers good corrosion resistance and is used for low-lead plumbing fittings, gas components and RoHS-critical CNC machined parts.
Yes — fully, with no exemption required, since lead is at or below 0.09%. That makes it immune to the post-2027 tightening of RoHS Exemption 6(c) that affects leaded grades.
C27450 is the economical lead-free choice for general parts; silicon brasses machine better (78–80% vs ~55%) 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.
RoHS compliant — no exemption required. 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.