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The tensile, flexural, and impact behaviours of calcium carbonate-impregnated coir fibre-reinforced polyester composites were evaluated. The short untreated coir fibres with different proportions of length, diameter, and filler content were used as reinforcements in polymer-based matrices. The fabricated composites with different levels of fibre parameters were tested as per ASTM standards. The mathematical models of mechanical behaviours were developed using statistical package. The effects of calcium carbonate on the mechanical properties of coir–polyester composites and prediction of mechanical properties using regression models were investigated.

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