What is the die electrode?
Red copper, or graphite can also be used as electrodes, with copper to fight things relatively light, and smaller particles, but the price is expensive, NC milling plus molding trouble.
Made of graphite particles is large, suitable for processing, but the price cheaper than copper graphite, light, and easy processing, now fire outside the shop general are carbon industry + electric spark, you pull over to the other die a copy to them, they directly processed graphite shipped back to you electric spark for all to you, the Yang you don't have to go to work there to do the carbon graphite spark.
