The resulting temperatures are displayed in Figure . The bar graph shows the temperature at the outer wall and in the bed for both polymers. Please note that the bars are partly transparent to show that the temperatures did not change for the repeating temperatures. It can be seen that the temperatures are comparable for both polymers and always exhibit a higher temperature inside the bed. The differences are more prominent looking at the temperature differences 𝛥𝑇 on a separate scale as displayed by the points. Here, the temperature difference is clearly increasing between inside the reactor and at the outer wall with increasing operation temperature. This does of course correlate with the different temperaturedependent catalyst activities. Moreover, the depiction shows a higher temperature difference for PFA than for PTFE; although, the activity in the PFA reactor tended to be lower as described in the section above. The higher temperature difference in the PFA reactor may be explained by a lower heat transfer through the material, as the manufacturer states heat transfer coefficients of 0.24 and 0.19 W m -1 K -1 for PTFE and PFA, respectively. In general, the PTFE reactor (see Table ) had a higher catalyst activity than the PFA reactor (see Table ) and thus a higher heat generation throughout the investigation. While the bed temperature is slightly underestimated for 160 to 200 °C, the theoretical temperatures are equal with the measured ones for 220 °C. It can be seen that the measured bed temperatures of the PFA and PTFE reactors are generally in accordance with the theoretically expected values. However, the discrepancy between the theoretical temperature increase, and the measured ones have a small deviation, always below one Kelvin. Thus, the difference between PFA and PTFE depicted in Figure is unspecific being within the typical margin of a temperature measurement.