Low temperature thermal conductivity of Kapton and Upilex

Abstract We measured the thermal conductivity of KaptonHN and UpilexR in the lengthwise direction of a single layer of material. The temperature range was investigated 0.1–9 K for Upilexand 0.2–5 K for Kapton. For both conductivities, we found a linear dependence on temperature that can be ascribed to the presence of crystalline units inside the solids.