ISO 20965:2005

Plastics — Determination of the transient extensional viscosity of polymer melts

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.

The method is capable of measuring the transient extensional viscosity of polymer melts at Hencky strain rates typically in the range 0,01 s^-1 to 1 s^-1, 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 10⁴ Pa.s to 10⁷ Pa.s.

Edition	2005
Published Date	2005
Published By	International Standardization Organisation
Page Count	18