Copper and Copper Alloys: The Ultimate Guide to Electrical Conductivity and Industrial Versatility
2026/07/03
1. Pure Copper: The Conductivity Champion
Pure copper (C11000 ETP, 99.90% minimum copper) achieves 100% IACS electrical conductivity. Applications include:
- Electrical Wiring and Busbars: Building wiring, power distribution, transformers.
- Electronics and PCB: Copper foil for high-density circuit boards.
- Heat Exchangers: Thermal conductivity of 401 W/m·K for HVAC and refrigeration.
2. Brass: Copper-Zinc Alloys
| Brass Type | Cu% | Zn% | Best For |
|---|---|---|---|
| Cartridge Brass (C260) | 70 | 30 | Deep drawing, ammunition cases |
| Free-Cutting Brass (C360) | 61.5 | 35.5 + 3% Pb | Precision machined components |
| Naval Brass (C464) | 60 | 39 + 1% Sn | Marine hardware, propeller shafts |
| Red Brass (C230) | 85 | 15 | Plumbing pipes, radiator cores |
3. Bronze: Copper-Tin and Specialty Alloys
- Phosphor Bronze (C510, C521): 5-8% tin, excellent spring properties for electrical connectors.
- Aluminum Bronze (C954, C955): Strength up to 690 MPa, seawater corrosion resistance for marine propellers.
- Silicon Bronze (C655): Good weldability for chemical processing equipment.
4. Market Trends
EVs contain 3-4x more copper than ICE vehicles. Renewable energy requires 4-6x more copper per MW. Sustained demand growth of 2.5-3% annually through 2035. Buyers should understand LME pricing mechanisms and supplier hedging practices.
