... , Dia2.5-70*100mm Usage:Used for electrical spark erosion carving, When we use hard alloy and ... mold steel for mold, we must use eletrical spark erosion equipment to carve the mold. If we ... using normal copper for spark eletrode, copper eletrode will be consumed fastly, and ... to much higher level. To reach high veracity in spark erosion, we strongly recomand our tungsten copper electrode. ...