NBN ISO 6721-10:2025

This document specifies the general principles of a method for determining the dynamic rheological properties of polymer melts at angular frequencies typically in the range of 0,01 rad s^-1 to 100 rad s^-1 by means of an oscillatory rheometer with a parallel-plate or a cone-and-plate geometry. Angular frequencies outside this range can also be used.

The method is applicable for determining values of the following dynamic rheological properties: complex shear viscosity ?*, dynamic shear viscosity ?', the out-of-phase component of the complex shear viscosity ?”, complex shear modulus G*, shear loss modulus G”, shear storage modulus G', phase angle d, and loss factor tand. It is suitable for measuring complex shear viscosity values typically up to ~10 MPa s.

NOTE            The shear loss modulus G´´ is sometimes also called viscous shear modulus and the shear storage modulus G´ is sometimes also called elastic shear modulus.