text: The base film is first made from bi-axially orienting a polypropylene film. It is created through a "film-blowing" process, in which the plastic is extruded using a film blowing machine in the shape of a tube. Through the process of foaming, gaseous bubbles can be formed at a fixed density in the tube, which would give rise to EMFi's "voided internal structure". It is then expanded into two different directions depending on the desired thickness and orientation (bi-axial orientation). The tube is then coated with some electrically conductive material and then cut open into a film. This film is then charged using the Corona Treatment, and the electrically conductive layers create electrodes.
  EMFiT sensor has three layers, two of which that are homogeneous and act as electrodes as mentioned above, and a middle layer that is filled with flat, disk-shaped voids. Upon receiving charge from the Corona method, electrical breakdowns occur and the surfaces of the voids are permanently charged. There is one basic type of EMFFIT sensor film manufactured currently, the thicknesses being 70 μm respectively.