Charpy Impact test

The Charpy impact test is a quick and simple test to facilitate a comparative material assessment.

Amongst other things, it is used to investigate the effects of changed formulation, compounding or injection molding conditions on the test specimen.

In the Charpy test, the test specimens are subjected to stress in a set-up similar to the three-point loading test and broken as soon as they are sufficiently brittle. Notched test specimens must be used in order to produce a break in ductile materials. The test is possible within a temperature range from –60°C to +80°C.


Results of the test method:
  • Charpy impact strength of an unnotched specimen aiU [KJ/m²]
  • Charpy impact strength of a notched specimen aiN [KJ/m²]
  • Incl. break assessment at the corresponding temperature and, where applicable, a rubber-glass transition
Key to method

Example: ISO 179/1 e A

Type of test specimenDirection of impactNotch depth
flat test specimen with dimensions l x b x h = edgewise
= flatwise
notch with 0.25 mm radius
notch with 1.00 mm radius
notch with 0.10 mm radius


Type of test specimenLength lWidth bThickness h
1 80 10 4
2 25 x h 10 or 15 3
3 11 x h or 13 x h 10 or 15 3

All dimensions in mm.