<![CDATA[The need for lightweight, strong, and environmentally friendly engineering materials has driven a massive shift from synthetic fiber composites to natural fiber composites. Natural fibers, such as bamboo, offer a promising alternative due to their abundance, renewability, low density, and high specific tensile strength. This study aims to determine the effect of fiber layer thickness variations (0.5 mm, 1.0 mm, and 1.5 mm), with a constant [±45o]s angle configuration, on the tensile and impact performance of bamboo fiber-polyester resin laminate composites. The sample preparation began by cutting high-quality bamboo to 300 mm in length and 10 mm in width, then planing it to achieve the required thickness variations. The bamboo fibers were then soaked in a 5% NaOH solution for 120 minutes, dried, and arranged into 4 layers with a fiber volume fraction of 30%. The tests conducted included tensile and impact tests to determine the optimum fiber thickness. The results showed that the smallest fiber thickness (0.5 mm) produced the highest mechanical strength, with a tensile strength of 11.201 MPa and an impact strength of 0.0033 Joule/mm². Conversely, increasing the fiber layer thickness decreased both tensile strength and impact strength.]]>
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