Film Capacitors
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Polyester Film Capacitors
This capacitor uses thin polyester film as the dielectric.
They are not high tolerance, but they are cheap and handy. Their tolerance is about ±5% to ±10%.
Polystyrene Film Capacitors
In these devices, polystyrene film capacitors is used as the dielectric. This type of capacitor is not for use in high frequency circuits, because they are constructed like a coil inside. They are used well in filter circuits or timing circuits which run at several hundred KHz or less, Above about the Polystyrene Film Capacitors information content.
...Film Capacitors
Film includes a variety of polymers, such as polyester, polycarbonate, Teflon, polypropylene, and polystyrene. Traditional film capacitors were only available in modest sizes, <10 uF. In recent years, film capacitors have sought to leverage their superior longevity compared to electrolytics, to move into some applications that call for much larger parts, even to thousands of uF. Film capacitors come in two broad categories, film-foil, and metallized film. Film-foil capacitors are made of alternating layers of plastic film and metal foil, while metallized film capacitors have the metal vacuum deposited directly on the film. In general, film-foil is better at handling high current, while metallized film caps are much better at self-healing. Various hybrid types can also be found, Above about the Film Capacitors information content.
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