Abstract
The effect of filler size to the flexural properties of the calcium carbonate (CaCO3) filled with unsaturated polyester (UP) composites have been experimentally investigated. The filler was derived from the shell of local clam known asPolymesoda bengalensis. The ground shells were graded into eight different sizes according to the sieve aperture size of which they could pass through. The sample with 4 wt% CaCO3reinforced with UP was fabricated. Then, the flexural test was done according to the ASTM D790. The result shows that for micron size filler, the flexural modulus was improved as the powder was filled into the UP matrix composite and the maximum value achieved at 574.81 μm mean diameter filler size. However, the infusion of the micron size CaCO3filler into the UP matrix decreases the flexural strength of the composites.
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