Transcription of DuPont Films
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DuPont Films
Polyimide filmHigh Performance FilmsKapton Corona Resistant Kapton CR Takes ElectricalInsulation Design and Reliability to New LevelsImproved Margin of OperationalSafetyDuPont Kapton CR polyimide film was developedspecifically to withstand the damaging effects of corona, which can cause ionization and eventualbreakdown of an insulation material or systemwhen the voltage stress reaches a critical development and testing by DuPont with ABBI ndustrie AG Switzerland (a subsidiary of themultinational ABB group) and Siemens AG, two ofthe world s foremost traction motor manufacturers,Kapton CR shows corona resistance or voltageendurance of greater than 100,000 hr at 20 kV/mm(500 V/mil) at 50 Hz. Kapton CR also providestwice the thermal conductivity ( W/m K) ofstandard Kapton . These substantial propertyimprovements increase the margin of operationalsafety and open the door to new electrical designpossibilities in traction motors, transformers, andelectrical rotating 1 shows the properties of Kapton CR andTable 2 shows the properties of the heat-sealableversion, Kapton FCR , which is laminated toDuPont teflon FEP film .
3 Figure 2 compares the corona resistance of Kapton® FCR, a heat-sealable version laminated to Teflon® FEP film, with that of standard Kapton® FN, which is also laminated to Teflon®.As ex-pected, the corona resistance of Kapton® FCR is substantially more than that of standard, laminated
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