© 2022 Author(s).This study examined the thermal properties of different composition raw kaolin and kaolin geopolymer filler in polypropylene copolymer (PP) composites. PP composites with varying composition of kaolin geopolymer filler (0 wt%, 2 wt.%, 4 wt.%, 6 wt.%, 8 wt.%, and 10 wt.%) was prepared and compared with PP copolymer composite with kaolin. Kaolin is an aluminosilicate based mineral filler used to prepare geopolymer paste by combining with alkaline activator solution. Characterization of PP copolymer composite based on kaolin geopolymer and kaolin was tested with Differential Scanning Calorimetry (DSC). Based on the research outcomes, kaolin geopolymer filler has large amounts of crystallinity in composites with higher melting temperature that ease the flow of melt for processing due to low viscosity.