Insulation Paper

Insulating Kraft Paper

Nomex Paper

DuPont„ Nomex paper Type 410 is an insulation paper which offers high inherent dielectricstrength, mechanical toughness, flexibility and resilience. Nomex paper Type 410 is theoriginal form of Nomex paper, and is widely used in a majority of electrical equipmentapplications. Available in 11 thicknesses (0.05 to 0.76 mm) (2 to 30 mil), Nomex paperType 410 is used in almost every known electrical sheet insulation application.Electrical propertiesThe typical electrical property values for Nomex paper Type 410 are shown in Table I. The AC Rapid Rise dielectricstrength data of Table I, representing voltage stress levels, withstood 10 to 20 seconds at a frequency of 60 Hz.These values differ from long-term strength potential. DuPont recommends that continuous stresses in transformersnot exceed 1.6 kV/mm (40 V/mil) to help minimize the risk of partial discharges (corona). The full wave impulse dielectricstrength data shown in Table I are based on multiple sheets. These values are appropriate for the applications whichemploy these materials in such configurations. Data based on single sheets of material are available upon request.The geometry of the system has an effect on the actual impulse strength values of the material