The article explains construction, application and features of film and foil organic dielectric capacitors: Film capacitors are essential electrostatic capacitors suitable for medium, higher voltage and higher current circuits. Unlike most other dielectric systems, film capacitors feature low loss factor at very low temperature.
Unlike most other dielectric systems, film capacitors feature low loss factor at very low temperature. Dielectric constant is not big, but they feature very high dielectric strength. In combination with long life and self-healing aging capabilities it makes them ideal choice for high voltage, high power systems.
The polyester film is most reliable and together with PP most used of the plastic films. It can be produced in thicknesses down to 0.7 μm (0.03 mils). Its tensional stability is high and its ε r ≈ 3.2. This has facilitated manufacture of one for organic dielectrics very space-saving capacitor.
Dielectric absorption ≤0.2%. A detailed article on film capacitors: construction, application and features. Discover the essential electrostatic capacitors and low loss factor at very low temperatures. Film capacitors are ideal for high voltage, high power systems.
Due to their construction, very thick electrodes, film / foil capacitors can carry higher currents than metalized types, but are much larger in volume. These capacitors can not recover after a breakdown. Therefore In some constructions double side metalized plastic film is used as electrode to replace the foil.
The most common dielectric materials used in the construction of plastic film capacitors are polypropylene and polyester.