Izod Impact test

The Izod impact test is a quick and simple test to facilitate a comparative material assessments.

Amongst other things, it is used to investigate the effects of changed formulation, compounding or injection molding conditions on the test specimen. Different effects can be simulated by varying the temperature and the notch shape.

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
  • Izod impact strength of an unnotched specimen aiU [KJ/m²]
  • Izod 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 180/4 A R

Type of test specimen
Flat test specimen with dimensions l x b x h

TypeLength lWidth bThickness h
1 80 10 4
2 63,5 12,7 12,7
3 63,5 12,7 6,4
4 63,5 12,7 3,2

All dimensions in mm.

Type of notch
U unnotched
A notch with 0.25 mm radius
B notch with 1.00 mm radius

Direction of impact
R notch on side facing away from hammer