<p>ISO 20965:2005 specifies the general principles of a method for determining the transient extensional viscosity of polymer melts. The procedure details the measurement of polymer melt specimens stretched uniaxially under conditions of constant strain rate and constant temperature.</p>
<p>The method is capable of measuring the transient extensional viscosity of polymer melts at Hencky strain rates typically in the range 0,01 s<sup>-1</sup> to 1 s<sup>-1</sup>, at Hencky strains up to approximately 4 and at temperatures up to approximately 250 °C. It is suitable for measuring transient extensional viscosity values typically in the range from approximately 10<sup>4 </sup>Pa.s to 10<sup>7 </sup>Pa.s.</p>
Registration number (WIID)
35591
Scope
<p>ISO 20965:2005 specifies the general principles of a method for determining the transient extensional viscosity of polymer melts. The procedure details the measurement of polymer melt specimens stretched uniaxially under conditions of constant strain rate and constant temperature.</p>
<p>The method is capable of measuring the transient extensional viscosity of polymer melts at Hencky strain rates typically in the range 0,01 s<sup>-1</sup> to 1 s<sup>-1</sup>, at Hencky strains up to approximately 4 and at temperatures up to approximately 250 °C. It is suitable for measuring transient extensional viscosity values typically in the range from approximately 10<sup>4 </sup>Pa.s to 10<sup>7 </sup>Pa.s.</p>
