Safely operating electric motors and generators depends on one small detail: reliable insulation.

High-voltage tests for extreme stresses

Document the lifespan of your machines

The mechanical load for insulation materials is extreme in high-voltage rotating machinery because of centrifugal forces arising from rotational speed and vibration. Thermal aging causes materials to become fragile and brittle. Insulation properties can deteriorate under high temperatures. We check the flexural and tensile strength as well as the continuous temperature resistance of your materials.

Ten Metric Tons of Pressure at 300 Degrees

We work with increased loads on standardized test pieces that model your insulation systems. Above all, we put your materials to the test under pressure of up to ten metric tons and peak temperatures of 300°C. You receive a durability test that can be used to document the qualification of your machine.

Our universal testing machine is used for the mechanical testing of insulation systems, composite materials, and wire products. The tests can be conducted under normal temperatures or hot ambient conditions.



  • Standards: e.g. ISO 527, ISO 178, ISO 14126
  • Max. force: 100,000 N
  • Max. temperature: 300°C

In more than 15 furnaces, long-term storage of test pieces is performed in order to measure reductions in weight or mechanical parameters after a defined storage period.



  • aging temperature: 350°C
  • Max. dimensions: 750 x 450 x 250mm
  • Max. weight: 30kg

When measuring the thermal conductivity, test pieces with a diameter of 55–60mm and a minimum thickness of 2mm are used perpendicular to the layer direction.



  • Standards: ASTM C518, ISO 8301
  • Diameter: 55–60mm
  • Smooth surfaces necessary
  • Different thickness of test pieces in accordance with the two-thickness method
  • Temperature range: 70–110 °C
  • Thermal conductivity measuring range: 0.1–10 [W/m K]

In this test, an insulation material is mechanically tested as part of a quick internal test. This means that it only takes a relatively short amount of time to make comparisons regarding mechanical properties after thermal exposure. The test also determines the aging temperatures for defining a temperature index in accordance with IEC 60216.



  • Mechanical heat values of 110, 130, 155°C
  • Short-term thermal aging at increased temperatures of up to 250°C

A muffle furnace can determine the organic content of an insulation system, and, therefore, provide information on inorganic content, such as mica or glass.



  • Standard: ISO 1172
  • Muffle furnace up to 600°C
  • Max. dimensions: 100 x 100 x 100mm

To specify a temperature index, a material is assessed based on the degradation of a certain property after thermal storage. Typical properties are a loss of mass in organic content or flexural strength. To perform this long-term test, test pieces are stored at different temperatures and tested cyclically. If the tested property reaches the previously defined limit value, the respective aging process ends and gives the piece’s lifespan. By extrapolating the lifespans at different temperatures, the temperature index can be determined using the Arrhenius curve, in other words the temperature index indicates the temperature at which the tested property has a lifespan of 20,000 hours.



  • Standard: IEC 60216
  • Max. aging temperature: 350°C
  • Max. dimensions: approx. 100 x 100 x 100 mm
  • Test duration: approx. 2 years

Learn more about our further tests

Electrical thermal

System tests

Fire tests