Specifically engineered for ultimate high temperature performance, the E3D v6 copper plated nozzle is made from a high temperature copper-alloy with a softening point above 500°C. Increased thermal conductivity makes these nozzles perfect for high temperature applications but also still suited for everyday filaments like PLA and ABS.
These nozzles feature a nickel plating to reduce the adhesion of plastic to the nozzle. Great for printing everyday filaments while keeping everything clean and shiny, but also useful above 300°C where a silicone sock can't be used.
Copper has more than 3x the thermal conductivity of brass, and the copper alloy E3D uses has been hardened and treated to reduce the oxidation that occurs in copper at high temperatures. The higher thermal conductivity will also slightly increase your heat-up times, and can provide tighter temperature control.
This copper-alloy is very temperature resilient, and will not start to soften or anneal until way beyond 500°C, making it perfect for the high-temperature printing that other nozzles can't handle.