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This International Standard specifies two methods (A and B) for determining, as a function of temperature, dynamic mechanical properties (shear modulus and mechanical damping) of plastics for small deformations within the frequency range from 0,1 Hz to 10 Hz. The values of shear modulus and mechanical damping as measured by one of these methods may not be in agreement with the values as measured by the other. The temperature dependence of these quantities over a sufficiently broad range of temperatures allows the transition regions (for example the "glass/rubbery" transition) of the polymer to be determined. It also gives information concerning the onset of plastic flow. Methods A and B described here are not applicable to non-symmetrical laminates, for which attention is drawn to ISO 6721.