In this paper, the change in mechanical properties of natural composite materials (apricot kernel peels and vinylester) using two different weight fractions (30 and 60) by immersing them in chemical solutions was studied experimentally. Hydrochloric acid in concentrations (31, 15 and 10.32%) and brine (Marmara Sea water) in concentrations (23, 11.5 and 5.75%) were used for immersion composite samples. In the practical section, several samples of apricot kernel peels were made using vinylester and placed in hydrochloric acid and brine. Through tensile testing the mechanical properties were obtained. The results were a decrease in the ultimate stress and modulus of elasticity of (23, 17 and 10%) and (29, 22 and 16%) for the effect of hydrochloric acid (31, 15 and 10.32%) respectively. Also, reduce the ultimate stress and modulus of elasticity by (12, 7, and 4%) and (10, 6 and 3%) for the effect of brine (23, 11.5 and 5.75%) respectively.
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