Resistance measurements according to standard

ATEX plastic materials (Directive 94/9/EG)

Correct handling of the resistance measurement (Original Material


In order to prevent electrostatic discharges, there are a number of effective countermeasures that prevent causing cost-intensive consequences on electronic components and assemblies or dust explosions.

Dissipative plastics from Murtfeldt ensure that working environments are equipped safely by

  • 1. avoiding charges or minimize them by discharging
  • 2. enabling an even discharge.

However, the customer often does not recognize upon delivery whether the material supplied by Murtfeldt is conductive, as it does not always differ from one another from the outside (such as Original Material "S" plus+® white ESD compared to Original Material "S"® natural).
At this point, it is now important to carry out a resistance measurement in accordance with the standard at goods receipt or later in production. This requires suitable measuring devices, equipped with resistance probes, which are measuring over the surface. The correct test voltage must be set.

If the customer uses voltmeter with measuring tips instead, the wrong result "isolating" can be displayed misleadingly, because only the point was measured.

To explain the picture: The two correct measurements shown below were performed on the same sample and reflect a slight difference in the measurement results.

If none of the suitable measuring instruments listed here is available to you, Murtfeldt will, of course, also issue a verification certificate based on an order-related measurement at your request.


Correct measurement I (resistance meter)

Correct handling of the resistance measurement (Original Material

Voltage >250V ; resistance meter
Result: 6MOhm
➔ conductive

Correct measurement II (with measuring probes)

Correct handling of the resistance measurement (Original Material

Voltage >250V ; measuring probes
Result: 9.79MOhm
➔ conductive

Wrong measurement (voltmeter with measuring tips)

Wrong handling of the resistance measurement (Original Material

Voltage: >250V ; voltmeter with measuring tips
Result: 1.97GOhm
➔ non-conducting


Our ATEX plastic materials