Film materials used in film capacitors

With the rapid advancement of technology, film capacitors are increasingly being utilized across a wide range of industries; consequently, the material used for the film itself plays a crucial role. Today, we will explore the characteristics of film capacitors made from different materials.

Two materials are commonly used in the production of film capacitors: polypropylene film and polyester film, while others—such as polystyrene film—are used less frequently. Let us examine the properties of these two materials as utilized by manufacturers.

First, consider polyester film. It is characterized by high insulation resistance, good self-healing properties, high volumetric efficiency, stable capacitance, a positive temperature coefficient, a wide operating temperature range, and a high dielectric constant. Polypropylene film, on the other hand, is distinguished by excellent high-frequency performance (low loss), superior self-healing capabilities, high insulation resistance, a high dielectric constant, a low negative temperature coefficient, and a low dielectric absorption coefficient. Each material has its own distinct advantages, resulting in different application areas for the capacitors produced from them.