Vulcanized rubber and thermoplastic elastomers (TPE) often fail in service due to the generation and propagation of a special type of rupture called a tear.

This test method measures the resistance to tearing action.

Tear strength may be influenced to a large degree by stress-induced anisotropy (mechanical fibering), stress distribution, strain rate, and test piece size.

The results obtained in a tear strength test can only be regarded as a measure under the conditions of that particular test and may not have any direct relation

to service performance.

The significance of tear testing must be determined on an individual application or product performance basis.

ASTM D624 – Geometry

There are several sample geometries that can be used for this test.

The sample types are easily found on the google machine or in the associated ASTM specification.

Type C is the most common, however Type B is also used to some degree.

Scissor Grips are a great solution for this elastomer tear strength test.

The samples have a tendency to thin out during the test which causes vise grips to slip and fail.

Scissor Grips as well as roller grips are self-tightening and thus are able to avoid maintain a constant lateral gripping force throughout the test.