6.2.1 Fill the cube with carbon and tap down gently, adding
carbon until the cube is full. Suspend the sample in the centre of the oven which has
been preheated to 140°C ± 2°C. Insert one of the thermocouples in the centre of the
sample and the other between the cube and the oven wall. Maintain the temperature of the
oven at 140°C ± 2°C for 12 hours and record the oven temperature and the sample
temperature.