ISO 6721-8:2019 PDF

Scope: This document describes an ultrasonic wave propagation method for determining the storage components of the longitudinal complex modulus L* and the shear complex modulus G* of polymers at discrete frequencies typically in the range 0,5 MHz to 5 MHz. The method is suitable for measuring materials with storage moduli in the range 0,01 GPa to 200 GPa and with loss factors below 0,1 at around 1 MHz. With materials that have a higher loss, significant errors in velocity measurement are introduced through waveform distortion and can only be reduced using procedures that are outside the scope of this document. The method allows measurements to be made on small specimens, typically 50 mm × 20 mm × 5 mm, or small regions of larger specimens or sheets. It is therefore possible to obtain information on the homogeneity or anisotropy (see 10.5) of modulus in a specimen.

ISO 6721-8:2019 Referenced Document

ISO 1183-1 Plastics — Methods for determining the density of non-cellular plastics — Part 1: Immersion method, liquid pycnometer method and titration method
ISO 1183-2 Plastics — Methods for determining the density of non-cellular plastics — Part 2: Density gradient column method
ISO 1183-3 Plastics - Methods for determining the density of non-cellular plastics - Part 3: Gas pyknometer method
ISO 6721-1 Plastics — Determination of dynamic mechanical properties — Part 1: General principles*， 2019-04-29 Update

2019 ISO 6721-8:2019 Plastics — Determination of dynamic mechanical properties — Part 8: Longitudinal and shear vibration — Wave-propagation method
1997 ISO 6721-8:1997 Plastics - Determination of dynamic mechanical properties - Part 8: Longitudinal and shear vibration - Wave-propagation method