An MPP (Metalized Polypropylene) element refers to the core component of an MPP capacitor. It is the part that stores electrical energy and provides the desired capacitance in the capacitor.
The MPP element is made up of several layers of metalized polypropylene film wound together. The film is typically coated on one or both sides with a thin layer of metal, such as aluminum or zinc, which acts as the conductive plates of the capacitor. The metalization process involves depositing a conductive metal layer onto the surface of the polypropylene film through a vacuum deposition technique