Product Information

CW004A, also known as Cu-ETP (Electrolytic Tough Pitch Copper) or C11000, is the most widely used oxygen-containing copper grade due to its exceptional electrical and thermal conductivity, high purity, and excellent formability. With a copper content of at least 99.90%, this alloy is the standard material for electrical and electronic applications, as well as for components in contact with drinking water under EU regulations. However, higher quality copper (oxygen-free) is more suitable when high strength is required (especially at high temperatures).

Key Characteristics

• Outstanding Electrical and Thermal Conductivity: Ideal for high-performance electrical systems.
• Excellent Formability: Suitable for both hot and cold forming.
• Good Corrosion Resistance: Forms a protective oxide layer; suitable for indoor and outdoor use.
• Joining: Excellent soldering, good brazing, fair gas-shielded arc welding, less suitable oxy-acetylene welding. 
• Limitations: Not recommended for reducing atmospheres above 300 °C due to risk of hydrogen embrittlement.

Applications

• Electrical Industry: Busbars, motor and transformer windings, connectors, terminals, and switchgear.
• Electronics: Stamped parts, relay components, and precision connectors.
• Construction: Roofing, flashing, gutters, and architectural elements.
• Industrial Equipment: Chemical process vessels, vats, and heat exchangers.
• Special Uses: Coaxial cables, underwater fiber optic cables, and superconducting components.

Cu-ETP (CW004A) 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.