<![CDATA[Coconut tree (cocos nucifera) is one plant that is widely grown in North Sulawesi many benefits of the overall crop. Since sawdust coconut trunks are not optimally its utilization as a filler for composite materials is studied. In addition to eco-friendly materials are easily obtainable.This study aims to determine the mechanical properties of the composites tested bending (ASTMD 6110) and impact (ASTMD 256-00) with grain variation using mesh 250, 180, and 90 using polyester resin matrix. Optimum impact Is obtained using 250 Mesh 60% volume fraction of resinFrom the data processing Bending test optimum bending moment obtained at 250 mesh resin volume fraction of 70%, and optimum bending stress obtained on 250 mesh 70% volume fraction. For optimum deflection on 250 mesh fraction 70% volume for optimum bending rigidity is at 250 mesh 60% volume fraction. Then it shows the variation of grain size, the volume fraction affects the value of the mechanical strength of the composite.Keywords: Impact, Bending, Composites, volume fraction, Fille]]>
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