Abstract The reinforcing efficiency of natural zeolite for thermoplastic polyurethane (TPU) is evaluated in terms of calcination and loading level. Calcination was applied to the zeolite powder before the compounding process. The surface area, chemical compositions, particle size distribution, and surface functionalities of pristine zeolite (Z) and calcined zeolite (C-Z) are confirmed via BET analysis, EDX, particle size analysis, and FTIR spectroscopy, respectively. The manufacturing of composi