ISO 6721-3:2021
ISO 6721-3:2021



This document specifies a bending-vibration method based upon resonance curves for determining the flexural complex modulus E*f of homogeneous plastics and the damping properties of laminated plastics intended for acoustic insulation, for example systems consisting of a metal sheet coated with a damping plastic layer, or sandwich systems consisting of two sheet-metal layers with an intermediate plastic layer. For many purposes, it is useful to determine these properties as a function of temperature and frequency.

General information 

  •  :  Published
     : 2021-02
  •  : 2
     : 13
  •  : ISO/TC 61/SC 5 Physical-chemical properties
  •  :
    83.080.01 Plastics in general

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