ASTM D 624 (D-624) - 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, 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. TestResources provides machines, grips, equipment, and fixtures for testing in accordance with ASTM D624.