Ball Indentation Method

The ball indentation method is used for the determination of the ball indentation hardness HB according to DIN EN ISO 2039-1 and evaluates the material hardness testing of thermoplastics and thermosetting plastics under quasi-static load. The method is based on the measurement of the indentation depth of a steel ball inserted into the surface of a specimen with a testing load. This testing load acts in a pre-defined time after a preload.

Specimen Preparation

  • Specimen requirements: smooth, flat, plane-parallel, minimum thickness of 4 mm (stacking possible)
  • Extraction from construction elements
  • Embedding, whetting and polish as needed

Testing Conditions

  • Hardness tester WOLPERT K 2524
  • 10 individual measurements
  • Hardened steel ball with a diameter of 5 mm
  • Preload: 9.8 N
  • Testing load (depending on materials): 49 N; 132 N; 358 N; 961 N
  • Air conditioning: standard climate (23 °C, 50 % humidity)

Accredited Standards

  • DIN EN ISO 2039:
    Plastics – Determination of hardness
    • Part 1: Ball indentation method


Dipl.-Wirtsch.-Ing. Stephan Arndt
Telefon: +49 (0)3461 30889-68



  • Ball Indentation Method
  • Hardness Test of Plastics
  • Polished Steelball


  • Ball Indentation Hardness HB


  • DIN EN ISO 2039-1

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