Plastics - Insulator or conductor, as required

Electrical tests

Plastic components combine an increasing number of functions in electrotechnical applications. Functionalized plastic components include insulators, heat conducting elements and user interfaces. To ensure the intended function and safety of the application, various electrical tests are required. The KUZ is dedicated on the one hand to the testing of functionalized plastic components and on the other hand to the further development of various electrical testing methods in application-oriented research projects.

  • Dielectric strength (high voltage tests)

    The application of plastics as insulators requires the determination of their dielectric strength. While the dielectric strength of materials is already measured in the accredited test laboratory up to 70 kV DC and up to 50 kV AC in accordance with DIN EN 60243, this is far from the end of our research. The focus here is on the suitability of modern highly filled plastics as thermal conductors and electrical insulators. Furthermore, the dielectric strength of entire components and assemblies can be investigated.

  • Volume and surface resistance

    Conductive or non-conductive? Different functions require different material properties. The current seeks its path - and this is characterized by the contact resistance on the shortest path through the component or along its surface (surface resistance). The KUZ offers testing of these properties according to DIN EN 62631-3-1. Conductive materials can also be quantified with our equipment. The standard DIN EN ISO 3915 is applied.

    Our research focuses on the behavior of highly functionalized sandwich components with migrating antistatic agents.

  • Tracking resistance

    The creepage resistance is the CTI value (comparative number of creepage) or the PTI value (test number of creepage). This can be tested up to 600 V according to DIN EN 60112. In the course of the use of plastics as insulators in high-voltage applications such as electromobility or in the field of regenerative energies, this limitation is often obsolete. Therefore, we are working intensively on the development and qualification of a tracking resistance test device up to 950 V within the scope of research work. In addition to device development, the effects of the high voltages are being investigated. As a result, charging infrastructures made of high-tech plastics, for example, can be tested in a more application-oriented manner.

  • Dielectric properties

    In order to assess the suitability of plastics in the field of cable sheathing, housings or in capacitors, the dielectric constant or dielectric loss factor of the material is often used. These ratios describe the permeability of a material to electromagnetic fields. In the KUZ, the dielectric characteristic values of plate-shaped sample material can be determined in a frequency range from 20 Hz to 15 MHz at room temperature according to DIN EN IEC 62631-2-1.

  • Flammability tests of plastic housings

    In addition to the task of insulating electrical equipment, plastics also protect against flames breaking through outside the housing in the event of fires - caused by electrical malfunctions or short circuits. For this purpose, the KUZ test laboratory offers fire tests according to UL94 (or DIN EN 60695-11-10) for applications in the E&E sector, as well as glow wire tests according to DIN EN 60695-2-11/12/13, among others.

Our equipment at a glance

High voltage tester DT2-50-20-SR-Pi-C-Sg

Dielectric strength tester


2101 Conversion FE

Leakage current tester


Milli-and TeraOhmmeter TO3

Resistance measurement

Fischer Elektronik


Glow wire tester

Fischer Elektronik

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Dr. Christian Schurig

Head of Accredited Testing Laboratory