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Phoenix  dactylifera l. pinnae (the green leaves of dates palm) were used as natural reinforcing (strengthening) fibers to improve the mechanical properties of polyester as a matrix material, the fibers of the green leaves of dates palm were used in two lengths, 10 and 20mm with five rates of 0, 2.5, 5, 10, and 20% , where the reinforcing with the leaves fibers increases the hardness strength from 76.5 to be about 86.55, the Impact value raised from about 0.313 to 0.461, in addition to that the flexural strength from 2.66 to be about 55, and the thermal conductivity increases from 2.54 ????∕????.℃ to 5.41 ????∕????.℃. The results of the present search explains that the composite samples reinforced at rate 20% and 10mm fiber length gives the best results.

Cows And Buffalo Horns waste particulate have been used as non-chemical reinforcement particulate to improve several features of polyester polymer, the particles of the cow and buffalo horns waste particles were used in three particle size 15, 200, 𝑎𝑛𝑑 300𝜇𝑚, at rates of 0, 2.4, and 6%, where the reinforcement process by the horns waste particles, where the hardness values have been increase from (60 to be 80), Young Modulus from 0.137 𝑀𝑃𝑎 to be 8.951 𝑀𝑃𝑎, while the density values have been deceases from (3.78 to 2.08) g/cm3 as a result of light weight of horn waste particles and the creation of voids and pores the reinforcing particles during the preparation process and the light weight (low density) of the reinforcement horn particles, in addition to that the thermal conductivity increases from (0.818 to be 1.489) W∕𝑚.℃.

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