The situation asked LG, the company promptly commented on the situation by telling that actually the chassis of the smartphone is made of aluminum not covered with any plastic. Here we have used only the thick layer of primer and paint, in order to obtain good contact of paint with aluminum. Aluminum alloy, which uses an LG patented in Korea as LM201b. It is used in the aviation and automotive industries. It's not quite the usual aluminum, to which we are accustomed in other smartphones. LM201b is cast in one piece, making it incredibly durable, but allows to keep small weight. Under a thick coat of primer and paint company hid the antenna in the device.
At the end of last week there were reports that the smartphone LG G5, which was announced by the manufacturer as a metal with a layer of plastic, which in turn hides and metal. Utuber JerryRigEverything showed that a box cutter can tear the cover away from the phone, and it's a lot like picking your plastic.