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In pursuing enhanced bio-composite properties, filler materials play a pivotal role. This study delves into the impact of ceramic additives on the chemical resistance and moisture durability of flax fiber-reinforced polymers. Utilizing the hand lay-up technique, we developed polyester composites reinforced with flax fibers. Silicon carbide (SiC) and aluminum oxide (Al2O3) were chosen as filler components. One batch of flax fibers underwent an alkaline treatment to enhance their properties further using a 5% NaOH solution. The resistance of composite samples to acetic acid and sodium hydroxide was then assessed. Additionally, the moisture absorption patterns of all models were investigated. A thorough comparative analysis was conducted among multiple composite batches. The results highlighted that integrating additives significantly bolstered the chemical and moisture resistance of the composites.