12.1.4 Inspect the extrusion plastometer for cleanliness (see
Note 10). All surfaces of the cylinder bore, die and piston shall
be free of any residue from previous tests.
12.1.5 Check the die bore diameter at frequent intervals
with appropriately sized go/no-go gauges (checked with die at
23 6 5°C) to verify that the die is within the tolerances given
in 5.3.1. Visually examine the die bore to verify that it is not
scratched or damaged. Also visually inspect the land of the
piston foot to verify that it is not scratched or damaged and use
a calibrated micrometer to verify that the dimensions are within
the tolerances given in 5.4.1 (see Note 11).
12.1.6 Set the temperature in accordance with the manufacturer’s
instructions.
12.1.7 A melt density value (see Table 1) for the material is
required in order to calculate MFR for the individual determinations.