The application note details the use of the new PerkinElmer Pyris STA 9 Simultaneous Thermal Analyzer for analyzing recycled polyethylene. It highlights the instrument's ability to perform thermal analysis without extensive sample preparation or calibration curves. Parameters such as melting point, degradation temperature, carbon black, and filler content are efficiently determined, facilitating a deeper understanding of recycled polymers' properties. The study contrasts the thermal characteristics of recycled polyethylene with virgin low-density and high-density polyethylene, indicating that the recycled material resembles higher density polyethylene. This information is vital for optimizing recycling processes and ensuring material quality.