While you may not remember this, it wasn't all that long ago that liquid mercury was in almost every home, in the thermostat temperature controller of your furnace/air conditioning system. Each thermostat had a tiny glass vial containing one fairly large drop of Mercury and a pair of contacts at one end. This vial was attached to a bi-metal coil that would tighten or loosen with the relative air temperature. As it tipped one way, it would move the drop away from the contacts, breaking a circuit and turning off the furnace; tip it the other way and the drop would envelope the contacts, turning on the furnace. In other words, it was used as a completely automatic power switch. This was normal. As you can see, there can be many kinds of conductor, depending upon the use for which you intend to put it.To which my counterpoint is the lack of mercury in use for its conductivity. Normally, when you use metal with the intention of it being a conductor, its going to a pure metal or an alloy like gold, silver, aluminum etc.
Or it could be more flexible, meaning that it would be preferable over plastic where resiliency and strength combined are more important, such as in iDevices. Really, it's almost worthless to guess at the moment, since Apple as signed for exclusive use under certain circumstances, which almost automatically excludes already-produced concepts by anybody else.It can if the entire case is conductive. Antenna placement is also crucial. What I would be interested in is the relative strength measurements of this material vs. aluminum. It could be more rigid per unit thickness, meaning it would be preferable over aluminum where form factor is crucial such as in iDevices.