BS ISO 6721-9:2019 pdf free

BS ISO 6721-9:2019 pdf free.Plastics一Determination of dynamic mechanical properties
This document describes a pulse propagation method for determining the storage component of the complex tensile modulus E’ of polymers at discrete frequencies typically in the range 3 kHz to 10 kHz.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 10 kHz. With materials having a higher loss, significant errors in velocity measurement are introduced through decay of amplitude.
The method allows measurements to be made on thin films or fine fibres and long specimens, typically tapes of 300 mm x 5 mm x 0,1 mm or fibres of 300 mm x 0,1 mm (diameter).
This method may not be suitable for cellular plastics, composite plastics and multilayer products.
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 1183-1, Plastics一Methods for determining the density of non-cellular plastics一Part 1: Immersion method, liquid pycnometer method and titration method
ISO 1183-2, Plastics一Methods for determining the density of non-cellular plastics一Part 2: Density gradient column method
ISO 1183-3, Plastics 一Methods for determining the density of non-cellular plastics 一Part 3: Gas pyknometer method
ISO 6721-1, Plastics一Determination of dynamic mechanical properties一Part 1: General principles For the purposes of this document, the terms and definitions given in ISO 6721-1 and the following apply.
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This instrument shall be capable of measuring the time interval between two pulses, one from transducer drive unit and the other from receiving transducer to an accuracy of±0,5 μs.
NOTE The time interval will depend upon the distance between the transmitting and receiving transducers and the sonic wave velocity in the material.BS ISO 6721-9 pdf free download.