12.1.11 Materials with higher expected flow rates will
require that the weight and piston support be used after
charging the material. For Procedure D, this can be accomplished
with the automatic weight lifting/lowering device. The
support shall be removed at such a time as to allow the
automatic timing device to activate at the starting point for the
first measurement within 7.0 6 0.5 min after the completion of
the charge. Only use the piston support if there is excessive
material flow (see Notes 16 and 17).
12.1.12 If a die plug is used to prevent excessive leakage
before the test, for materials with a melt flow rate greater than
50 g/10 min, then the die plug is to be inserted before the
charge and removed prior to removing the piston/weight
support. The initial charge shall be adjusted to ensure appropriate
measurement loads based on suggestions in Table 1. If
the timer is not activated within 7 6 0.5 min after the
completion of the charge the test must be repeated with
readjusted charge weights.