Electrolytic copper [99.9% Cu]:
The copper we use as standard. The very high conductivity of electricity and heat makes this an ideal material for general electrical applications in industry.
This material is hard to turn and mill but lends itself very well to soldering and brazing.
Copper Chrome Zirconium [98.5% Cu - 1,2% Cr - 0.3% Zr]:
This copper has very similar properties in terms of conductivity but its hardness is increased.
It is mostly used in welding applications where wear is an important factor.
Copper Cobalt Beryllium [96.5% Cu - 0.7% Be - 2.8% Co]:
The hardness of this copper variant is increased compared to CuCrZr in order to reduce the wear