Codes & Standards - Purchase
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 (see NOTEs 1 and 2). It is suitable for measuring transient extensional viscosity values typically in the range from approximately 104 Pa·s to 107 Pa·s (see NOTE 3).
NOTE 1 Hencky strains and strain rates are used (see Clause 3).
NOTE 2 Values of strain, strain rate and temperature outside these limiting values can be attained.
NOTE 3 The operating limit of an instrument, in terms of the lowest transient extensional viscosity values that can be measured, is due to a combination of factors, including the ability of the specimen to maintain its shape during testing and the resolution of the instrument.