9.1.5 To verify the calibration of the temperature measurement
system at elevated temperatures, use hexadecane. The
temperature measurement system shall indicate, at 50%
recovered, a temperature comparable to that shown in Table 4
for the respective apparatus under Group 4 distillation conditions.
NOTE 12—Because of the high melting point of hexadecane, Group 4
verification distillations will have to be carried out with condenser
temperatures >20°C.