ASTM D531 is a standard test method for measuring the dynamic mechanical properties of plastic materials using a torsional pendulum. This test method is designed to measure the loss factor and modulus of rigidity of plastic materials, which are important mechanical properties that can affect the performance of plastic products in a variety of applications.

The test involves subjecting a sample of the plastic material to a small, sinusoidal twist at a known frequency and measuring the resulting torque and phase angle of the twist. From these measurements, the loss factor and modulus of rigidity can be calculated, which provides information about the material’s ability to dissipate energy and resist deformation under dynamic loading.

ASTM D531 is widely used in the plastics industry for quality control and material specification. It is also used in research and development to study the effects of various factors on the dynamic mechanical properties of plastic materials, such as temperature, frequency, and composition.

NextGen’s Pusey & Jones Portable Hardness Tester complies with ASTM D531 standard.

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