Weight %. Aluminium and arsenic inhibit dezincification; lower zinc supports DZR performance.
| Element | Symbol | Min % | Max % | Typical % |
|---|---|---|---|---|
| Copper | Cu | 62.0 | 64.0 | 63.0 |
| Zinc | Zn | Balance | ~33 | |
| Lead | Pb | 1.2 | 1.6 | 1.4 |
| Aluminium ✓ | Al | 0.5 | 0.7 | 0.6 |
| Arsenic ✓ | As | 0.02 | 0.15 | 0.08 |
| Property | Condition | Value | Unit |
|---|---|---|---|
| Tensile Strength (Rm) | R280 soft → R400 drawn | 280–400 | MPa |
| Proof Stress (Rp0.2) | temper-dependent | 130–250 | MPa |
| Elongation (A) | soft → drawn | 5–30 | % |
| Hardness | soft → drawn | 70–105 | HB |
| Machinability | vs CuZn39Pb3 = 100 | ~70% | — |
| Density | — | 8.44 | g/cm³ |
| Thermal Conductivity | — | ~93 | W/(m·K) |
| Melting Range | solidus–liquidus | 875–900 | °C |
| Standard | Designation |
|---|---|
| EN (Europe) | CW625N / CuZn35Pb1.5AlAs |
| Type | Dezincification-resistant (arsenical) brass |
| DIN (Germany) | CuZn35Pb1.5AlAs |
| ISO | CuZn35Pb1.5AlAs |
| Related DZR grades | CW602N · C35330 |
CW625N (CuZn35Pb1.5AlAs) is a dezincification-resistant (DZR) leaded brass per EN 12164/12165 — aluminium and arsenic inhibit dezincification. It is used for water fittings and valve components where corrosion resistance matters; it is leaded, not lead-free.
Yes, under RoHS Annex III Exemption 6(c) (lead up to 4% in copper alloys), currently valid to 30 June 2027. For mandatory lead-free applications specify CW724R or C69300 silicon brass.
CW614N and CW617N are standard leaded machining/forging brasses. CW625N (CuZn35Pb1.5AlAs) is different — a dezincification-resistant (DZR) grade with aluminium and arsenic added to resist dezincification in water, trading some machining speed for corrosion resistance.
CW625N is a dezincification-resistant (arsenical) brass; the comparable DZR grades are CW602N (CuZn36Pb2As) and C35330. For lead-free service use CW724R or C69300 instead. Composition is specified in EN 12164; Brassland supplies EN 10204 Type 3.1 mill certificates with every lot.
Machining economy plus forming headroom, 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: 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.