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The general structure of metal film capacitors | Focus on middle and high-end brand capacitor manufacturers

by:Shenmao     2021-03-27
Metal film capacitors belong to the category of organic film capacitors, also known as polyester capacitors. It is made of metal foil or metal film as the electrode and polyethylene terephthalate (polyester for short) film as the medium, which is wound into a plastic shell and sealed. In some capacitors, the wound core is encapsulated with colored epoxy resin. Capacitors made with metal film electrodes are called metallized polyester film capacitors. The general style of metal film capacitors is shown in the figure: Metal film capacitors have the following characteristics: 1 The capacitance range of the capacitor is relatively wide, generally 470pF-4μF. 2 The ratio capacitance of the capacitor is larger and the volume is small. 3 Good heat resistance, moisture resistance, and high compressive strength. 4 The stability is poor, and the loss increases with the increase of frequency. 5 Low cost and cheap price. 6Metalized polyester film capacitors have self-healing ability. Metal film capacitors are suitable for occasions with low stability requirements, such as general electronic instruments, meters, radios, etc., for direct isolation, coupling and bypass use. It should be noted that although the withstand voltage of the metal film capacitor is relatively large, the self-healing property of the metal film capacitor is poor. No matter how the appearance of the capacitor changes, it is always a structure, and two plates are separated by an insulating material. If you open it, you can see the metal film rolled into a ball.
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