KEMET PHZ9004 metallized polypropylene (plastic) film capacitors feature very low losses and the lowest dielectric absorption of all film dielectric materials. KEMET PHZ9004 capacitors have a very high dielectric strength and high insulation resistance with a negative temperature coefficient. KEMET PHZ9004 metallized plastic film capacitors are typically used in AC applications and mains filtering, but are also used as stable oscillators and filters. KEMET PHZ9004 metallized plastic film capacitors exhibit self healing characteristics that works if a conducting particle or voltage surge punctures the dielectric, an arc occurs at the point of failure, thus melting the surrounding metal and insulating the area of the breakdown. In metallized plastic film dielectrics a breakdown causes a reduction of the insulation resistance due to a higher carbon deposit in the breakdown channel compared to paper film dielectrics.