9.8 For materials with flow rates greater than 10 g/10 min,
a weight (and if needed, a piston) support must be used to
prevent the piston from travelling during the pre-heat period in
order to ensure that there is enough material in the bore to
correctly test the material. The support is to be installed in a
manner that holds the lower scribe mark of the piston approximately
25 mm above the top of the guide bushing or other
suitable reference mark. Alternatively, it is acceptable for the
operator to delay applying the weight to the piston. The support
shall be removed or the weight applied to the piston at such a time as to allow the operator to make the initial cut-off within
7 6 0.5 min of the completion of the charge.