Film capacitor is a kind of capacitor with excellent performance because it has many excellent characteristics. Its main characteristics are as follows: no polarity, high insulation impedance, excellent frequency characteristics (wide frequency response), and minimal dielectric loss. Based on the above advantages, film capacitors are widely used in analog circuits. Especially in the part of the signal connection, must use the frequency characteristics of good, dielectric loss is very low capacitor, in order to ensure that the signal in the transmission, there is not too much distortion situation. Among all the plastic film capacitors, and polypropylene (PP) capacitors and polystyrene (PS) capacitors are the most significant characteristics, of course, these two capacitors are relatively high price. However, in order to improve the quality of sound, the parts and materials used by audio equipment have become more and more advanced, and the price is not the most important factor to consider. Therefore, the frequency and quantity of PP capacitor and PS capacitor used in audio equipment are also increasing.

Film capacitors are mainly used in electronics, home appliances, communications, electric power, electrified railway, hybrid electric vehicles, wind power generation, solar power generation and other industries. The stable development of these industries has promoted the growth of film capacitor market.