In this research, the effect of chemical solutions on the mechanical properties of natural composite materials (eggshell with Vinylester) was studied experimentally. Three different weight fractions (30, and 60) were used. hydrochloric acid with concentrations (31, 15, and 10.32%) also, brine solution (Marmara Sea water) with concentrations (23, 11.5, and 5.75%)was used. In experimental work, many samples of eggshell with Vinylester with different weight fractions were manufacturing and placing it in hydrochloric acid and brine solution. Mechanical properties were found from tensile test. The result show that, decreasing in ultimate stress and modules of elasticity by (23, 17, and 10%) and (29, 22,and 16%) for effect of hydrochloric acid (31, 15, and 10.32%) respectively. Also, decreasing ultimate stress and modules of elasticity by (12, 7, and 4%) and (10, 6, and 3%) for effect of brine solution (23, 11.5, and 5.75%) respectively.

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