Product Information

CuZn21Si3P (CW724R, ECOBRASS) is a special lead-free brass alloy containing approximately 75–77% copper, 21–22% zinc, 2.7–3.5% silicon, and a small addition of phosphorus. Its composition provides high resistance to dezincification, very good machinability, and excellent hot workability. It is suitable for applications requiring contact with drinking water and complies with European hygiene and safety regulations.

Key characteristics

• High resistance to dezincification and stress corrosion cracking: suitable for drinking water and aggressive environments
• Lead-free composition: complies with RoHS, ELV, and European drinking water directives
• Very good machinability: suitable for turning, drilling, and automatic machining (machinability index approx. 60–70% compared to leaded brass)
• Excellent hot workability: ideal for forging, stamping, and other forming operations
• Good strength and hardness: tensile strength up to 670 MPa, yield strength up to 400 MPa, hardness 130–220 HBW (depending on condition)
• Good polishability and solderability
• Stable mechanical properties and long service life

Applications

• Fittings and plumbing: couplings, valves, taps, components for contact with drinking water
• Automotive industry: connectors, sensors, valve bodies, fuel system parts
• Mechanical engineering: precision turned parts, screws, nuts, bushings
• Electrical engineering: terminals, connectors, housings, lighting components
• Consumer goods: components requiring high surface quality and durability

CuZn21Si3P (CW724R) is listed in the European Positive List under Commission Implementing Decision (EU) 2024/367, ensuring compliance with Directive (EU) 2020/2184 for materials in contact with drinking water. This guarantees its suitability for hygienic and safe use in potable water systems.