ISO 11443:2021 pdf download – Plastics — Determination of the fluidity of plastics using capillary and slit-die rheometers.
3.10 Rabinowitsch corrected apparent viscosity η apR ratio τ γ ap / & of apparent shear stress τ ap to true shear rate & γ (3.6), expressed in pascal seconds (Pa∙s) Note 1 to entry: This term is appropriate for use when testing with a single die of large length-to-diameter aspect ratio for which entrance effects are negligible. 3.11 volume flow rate Q volume of melt flowing through the die per unit time, expressed in cubic millimetres per second (mm 3 /s) 3.12 swell ratio at room temperature S a ratio of the diameter of the extrudate to the diameter of the capillary die, both measured at room temperature 3.13 swell ratio at the test temperature S T ratio of the diameter of the extrudate to the diameter of the capillary die, both measured at the test temperature 3.14 percent swell at room temperature s a difference between the diameter of the extruded strand and the diameter of the capillary die, expressed as a percentage of the diameter of the capillary die, both measured at room temperature 3.15 percent swell at the test temperature s T difference between the diameter of the extruded strand and the diameter of the capillary die, expressed as a percentage of the diameter of the capillary die, both measured at the test temperature Note 1 to entry: Equivalent slit-die extrudate swell terms can be derived based on the thickness of slit-die extrudate with reference to the slit-die thickness. 3.16 preheating time time interval between completion of charging of the barrel and the beginning of measurement 3.17 dwell time time interval between the completion of charging of the barrel and the end of measurements Note 1 to entry: In certain special cases, it can be necessary to note the dwell time at the end of each measurement where more than one measurement per barrel filling is made.