Particulate filled polymer composites are becoming attractive because of their wide applications and low cost. In this study the effects of metakaolin (Surface treated & non-treated) with varying concentration on the mechanical properties of some commercial thermoplastic polymers was investigated. Composites of low density polyethylene, high density polyethylene and polypropylene with varying concentrations (viz. 5 to 30 weight %) of metakaolin were prepared by screw extrusion. Mechanical properties such as tensile strength, tensile modulus, flexural strength, flexural modulus and impact strength were found to increase with metakaolin concentration. Morphological studies revealed that there is a good dispersion of metakaolin in the polymer matrix.
