Tensile Impact, Izod and Charpy

   

The UL Thermoplastics Testing Center can carry out the following tensile impact, izod and charpy tests for you.

 

 

Tensile Impact test

The tensile impact test is a tensile test with a very high deformation speed.

However, the only value determined is the impact energy consumed. The tensile impact test frequently has a large spread of measured values. It should consequently only be used if no break occurs in impact or notched impact tests or if it is expressly required, for example in case of thermal ageing according to UL 746 B in order to determine the TI.

Results of the test methodValues for stress and strain such as:
  • Tensile impact strength of an unnotched specimen, atU [KJ/m²]
  • Tensile impact strength of a notched specimen, atN [KJ/m²]

 

 

 

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

 

 

 

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
unnotched
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.