Abstract Thermally stimulated discharge current (TSD) tests on PVC, chlorinated polyethylene, and paraffins always show a relatively low-intensity transition in the − 100 to 80 °C range. Several chlorine-containing polymers one paraffin were tested up 70% chlorine content by short-circuited TSD method. The intensities of these transitions maximum at about 40% except for PVC. Knowing random natu...