Choosing the right tungsten copper (WCu) grade is critical to performance, service life, and cost efficiency. The ideal grade depends on your priority: conductivity, heat resistance, hardness, or arc erosion resistance.
Understand Tungsten-Copper Ratio Logic
Higher tungsten content → higher hardness, better high-temperature stability, stronger arc resistance.
Higher copper content → better electrical and thermal conductivity, easier machining.
WCu70 (70% W, 30% Cu)
Best for: General electrical parts, low-voltage contacts, simple EDM electrodes
Strengths: Highest conductivity in standard WCu grades, easy to machine
Avoid: Extreme high-temperature or heavy arcing environments
WCu75 (75% W, 25% Cu)
Best for: Medium-load electrical contacts, welding electrodes, general EDM electrodes
Balance: Good conductivity + decent wear resistance
Most versatile grade for common industrial applications
WCu80 (80% W, 20% Cu)
Best for: High-voltage switchgear, EDM electrodes for carbide, resistance welding
Strengths: Strong anti-arc performance, high density, stable at high temperatures
Industry standard for electrical and thermal management parts
WCu85 / WCu90 (85%–90% W)
Best for: Heavy arcing contacts, aerospace components, heat sinks, military parts
Strengths: Extreme hardness, excellent ablation resistance, ultra-high density
Trade-off: Lower conductivity, more difficult to machine
Quick Selection Guide
Need max conductivity: Choose WCu70
Need balanced performance: Choose WCu75 / WCu80
Need high temperature & arc resistance: Choose WCu85 / WCu90For EDM or welding: WCu80 is most widely recommended
For aerospace & heavy-duty electronics: WCu85 or WCu90
If you need custom performance, we can also provide tailored tungsten copper compositions to meet your specific application requirements.