WCu70 vs WCu80 vs WCu90: Properties & Uses Comparison

WCu70, WCu80, and WCu90 are the three most widely used Tungsten Copper grades in industrial applications. Each grade has unique properties determined by its tungsten-copper ratio, making them suitable for different scenarios. Understanding their differences helps you select the most cost-effective and high-performance material.

Detailed Grade Comparison

WCu70 (70% Tungsten, 30% Copper)

Key Properties: Highest electrical and thermal conductivity among standard tungsten copper grades, good machinability, moderate hardness and density (12.5–13.5 g/cm³).

Advantages: Easy to machine, cost-effective for general applications, excellent conductivity.

Applications: Low-voltage electrical contacts, general industrial components, simple EDM electrodes, and parts requiring high conductivity.

WCu80 (80% Tungsten, 20% Copper)

Key Properties: Balanced performance—excellent arc erosion resistance, good thermal stability, moderate conductivity, higher hardness and density (14.5–15.5 g/cm³) than WCu70.

Advantages: Versatile, industry-standard grade, suitable for most industrial applications, good balance of performance and machinability.

Applications: EDM electrodes, resistance welding electrodes, high-voltage switches, electrical contacts, and general industrial components.

WCu90 (90% Tungsten, 10% Copper)

Key Properties: Highest hardness and density (16.5–17.5 g/cm³), extreme high-temperature resistance, excellent arc erosion resistance, lower conductivity than WCu70 and WCu80.

Advantages: Superior durability in extreme environments, ideal for heavy-duty applications.

Applications: Aerospace components, heavy-duty electrical contacts, heat sink parts, military equipment, and high-temperature structural parts.

Final Selection Summary

• Choose WCu70 if you prioritize electrical/thermal conductivity and easy machining for general applications.

• Choose WCu80 for most industrial use cases— it offers the best balance of performance, durability, and cost.

• Choose WCu90 for extreme high-temperature, high-wear, or heavy-duty environments (e.g., aerospace, military).