ISO 34-1 Test Standard Explained

Tear Strength - ISO 34-1

The force required to tear a specified test specimen divided by the specimen thickness.

This test provides a measure of resistance to tearing. Tear strength may also be used to illustrate the anisotropy of a material.

Testing is performed by pulling specimens apart using a tensile test machine. Three methods are employed. Method A is preferred because it is not sensitive to the length of the cut in the specimen and test resuts are more easily related to the tear properties of the material. Method B (unnicked) measures a combination of tear initiation and propagation. Method B (nicked) and Method C each measure tear propagation.

Method	Specimen Name	Diagram	Grip Separation	Test
A	Trouser		100 mm/min
B	Angle (nicked or unnicked)		500 mm/min
C	Crescent (nicked)		500 mm/min

Similar Standards

• ASTM D624

Property information for specific grades of resin are available in the Prospector Plastics Database.