Objectives of Izod impact tests to ISO180

The basic features of the method for measuring Izod impact strength to ISO 180 are based on ASTM D256, however, it uses different specimen dimensions and provides a normative framework for both the measurement of impact strength on unnotched specimens, and notched impact strength and notch sensitivity on notched specimens.

The ISO 180 standard supports the commonly used edgewise impact, as well as the less common flat-sided impact.

When testing long-fiber-reinforced composites, an additional distinction is made between an impact perpendicular to the fiber direction and an impact parallel to the fiber direction, depending on the fiber orientation.

The Izod flexural impact test and notched flexural impact test to ISO 180 delivers characteristic values for the impact strength at high strain rates in the form of a cross-section related energy value.

The tests are normally carried out after conditioning in a normal climate of 23° / 50% relative humidity to ISO 291.

Applications include:

• The comparison of different molding materials
• Tolerance monitoring within the scope of goods inwards checks and quality assurance
• Testing of finished parts based on machined specimens
• Creation of material cards
• Measurement of aging effects

Izod impact and notched impact tests are also offered in the form of instrumented tests, that is, with fast force measurement. However, there is no standard for this yet.