Mylar, Polycarbonate,Polyester,Polystyrene are the most common four types of plastic film capacitors. These four types have their own properties, so they can be used in different specific applications.

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Their values may range anywhere from several picofarads to a few microfarads dependent upon the actual type. Normally they are non-polar. In general they are good general-purpose capacitors that may be used for a variety of purposes, although their high frequency performance is not usually as good as that of the ceramic types. Some of the more common types include:

• Mylar - Can introduce noise when used in applications where there is vibration.
  
  
• Polycarbonate - Moderate level of loss which can increase with frequency. Very high insulation resistance.
  
  
• Polyester - Moderate level of loss which can increase with frequency. Very high insulation resistance.
  
  
• Polystyrene - tend to be very low loss but bulky. Have a temperature coefficient of around -150 ppm / C