ASTM D624 helps measure a property of conventional vulcanized rubber and thermoplastic elastomers called tear strength. Vulcanized rubber and thermoplastic elastomers (TPE) often fail due to the generation and propagation of a special type of rupture called a tear. ASTM D624 measures the resistance to tearing action. ASTM D624 measures the force per unit thickness required to rupture, initiate, or propagate a tear through a sheet of rubber in the form of one of several test piece geometries.

Testing Procedure

Prepare the test pieces and place them in the grips of a testing machine using care to adjust the test piece so that it will be strained uniformly along its length, and that sufficient material is clamped in the grips to minimize slippage. Start the machine at a steady rate of grip separation.

For Type A, B or C test pieces, the rate of jaw separation should be 500 mm/min. (20 in./min.). For Type T and Type CP test pieces, the rate of jaw separation should be 50 mm/min. (2 in./min.). Strain the test piece until it is completely ruptured. Record the maximum force for Type A, B or C test pieces. For Type T or CP test pieces, take a continuous recording of the force throughout the tearing process.

For ASTM CD624, you may use an electromechanical universal test machine along with a pneumatic or mechanical set of grips. By means of our testing expertise and modular product design, we will help find the testing solution that is right for you. Give one of our application engineers a call today for help with creating the best budget and testing plan according to ASTM D624.

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