Electro Reactive Plating, or E-Plates, is a type of armor used by certain Vaul units composed of Plasteel alloys and electro reactive polymers. When subjected to high levels of electricity, the molecular structure of the alloy polarizes and enters Transphase where density and durability is increased significantly (Star Trek - Enterprise: Polarized hull plating). The appearance of the alloy also changes from black or dark grey to pure white (Halo: TR Steel).