DIN EN IEC 62631-2-3:2025-06

This part of IEC 62631 specifies the measuring technology and the test method for the relative permittivity and dielectric dissipation factor of thin single layer insulating polymer film without any additional metallization on the sample surface. The adaptive thickness range is approximately 10 μm to 100 μm. The proposed frequency is the power frequency (50 Hz or 60 Hz), and it is also suitable in the technical frequency range from 1 Hz to 1 MHz. Measuring the relative permittivity and dielectric dissipation factor (tan δ) of thin insulating polymer films with a thickness of approximately 10 μm to 100 μm without an additional layer is important for insulation applications. Currently, there is a lack of suitable technology and a standard for measuring the relative permittivity and dielectric dissipation factor of very thin single-layer polymer films. By using multilayer polymer films with 20 to 50 layers, it may be possible to determine the mean value of the relative permittivity and dielectric dissipation factor of insulating polymer films; however, the effect of air gaps within them should not be ignored. With metallized electrodes on the surface of the polymer film, acceptable results for the relative permittivity and dielectric dissipation factor of an insulating polymer film can be obtained in the research laboratory.