9.9 At the end of the pre-heat period and when the top scribe
mark on the piston is visible above the cylinder (or top of the
guide sleeve) and the lower scribe mark is in the cylinder (or
below the top of the guide sleeve) indicating that the piston
land is 46 6 2 mm from the top of the die, reset the timer to
zero then simultaneously make the initial cut-off. Discard the
extrudate from the pre-heat period. Make the final cut-off
exactly when the time interval selected (see Table 1) is reached.
Collect and weigh the extrudate specimen. If the extrudate
specimen contains visible bubbles, discard it and begin the test
again. If the initial cut-off was initiated outside of the tolerances
of the pre-heat period or the piston position requirements,
discard the specimen and repeat the test with readjusted
piston position after the initial purge, or change the weight.