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This research looked into the possibility of using residual calcium carbonate (CaCO3) as a by‐product of the cane sugar production process combined with polypropylene (PP) to replace commercial CaCO3. Using a co‐rotating twin‐screw extruder, the CaCO3/PP composites were made in the following ratios: 10:90, 20:80, 30:70, 40:60, and 50:50, with the addition of maleic anhydride polypropylene at 5 wt%...