ASTM D6049 Test Method for Rubber Property Measurement of the Viscous and Elastic Behavior of Unvulcanized Raw Rubbers and Rubber Compounds by Compression Between Parallel Plates

In ASTM D6049, the rheological behavior (viscosity and elasticity) of unvulgarized raw rubbers and rubber compounds, and the macrostructure of rubber polymers, can be measured and characterized using this test method. The values expressed in SI units should be considered the standard.... Read More

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    This test method has a strong discriminating power and measures viscosity and elasticity-related parameters under low shear circumstances. It is capable of detecting minute rheological changes. The results of this test method may be valuable in forecasting processability, but because conditions vary so much the correlation between actual manufacturing processes must be proven in each case. This test method can be of use for compliance, quality control, refereeing, and research and development.

    Test Procedure:

    In ASTM D6049, the test temperature should be 105 ±1 °C (221 ±2 °F). Individual test pieces were centered between the parallel plates during the test. The test item is compressed to a height of 7.0 mm (0.28 in.) with a constant force. The test piece height is measured in 0.1 mm (0.004 in.) increments for the first recovery cycle. In most cases, testing a single test component is sufficient.

    Video 01: Tire Rubber Powder Devulcanized

    Test Specimen:

    The diameter of the compression device should be 30.0 ±0.1 mm and a thickness of at least 2 mm.


    ∆ dt21 = 100 × (dt2 – dt1) / dt1


    ASTM D6049 test method is used for the characterization and measurement of rheological behavior (viscosity and elasticity) of unvulgarized raw rubbers and rubber compounds and the macrostructure of rubber polymers.


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