<![CDATA[As a maritime country, Indonesia generates substantial amounts of shell waste that remain underutilized. This study aimed to utilize Perna viridis shell waste as a filler in epoxy resin composites and investigate the effect of particle size on their physical and mechanical properties. We used a quantitative experimental approach, fabricating specimens using the mold casting method. The composite contained 35% filler by mass. Tensile testing followed ASTM D638 Type I, and impact testing followed ISO 179 using the Charpy method. We also performed porosity testing and macrographic observations to evaluate the material structure. The results showed that increasing the mesh size from 80 to 120 reduced porosity from 18.61% to 13.37% and increased tensile strength from 28.77 to 33.04 N/mm². In contrast, impact toughness decreased from 0.051 to 0.047 J/mm². Finer particles improved composite density and interfacial bonding, resulting in higher tensile strength but greater brittleness under impact loading.]]>
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