Natural gelcoat was prepared from carrot waste powder as a coloring and strengthening material to epoxy by mixing it with different weight ratios (1, 2, 3, 4, 5, 6, 7 and 8% ). The effect of the particle size of the micro Carrot powder was studied, using two different sizes (0.5 and 0.25 microns) on the mechanical properties (impact, flexural and hardness) and thermal conductivity. The impact strength increased from (10.09 KJ/ m2) for neat epoxy to (13.44 KJ/ m2) for epoxy with 2% of 0.5 MCF and to (18.86 KJ/ m2) for epoxy with 1% 0.25 MCF, flexural strength increased from (41.94 MPa) for neat epoxy to (∼ 64 MPa) for epoxy with 2% of 0.5 MCF and to (82.38 MPa) for epoxy with 1% of 0.25 MCF, hardness of neat epoxy was (∼ 76) and almost maintains its value for epoxy with 2% of 0.5 MCF and for epoxy with 1% of 0.25 MCF. The internal structure of these composites was also studied using a scanning electron microscope, to explain the superiority of the (EP/ 0.25MCF) over the other composite (EP/ 0.5MCF) in all mechanical properties in addition to thermal conductivity, using EDX technique the ratios of elements composition are determined of the epoxy composites this ratios was linked with the color of the composites. Finally the diffusion of water in epoxy/ sub microns carrot fibers (EP/ 0.5MCF) and (EP/ 0.25MCF) composites have been determined for six weeks of immersion.

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