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years after planting and has a productive life of up to 12 years. It is mainly grown in South America and Africa; Sisal fiber is hard, coarse, long (1–1.5 m), very resistant and almost white, ivory or pale yellowish in color [ 7 , 8 , 9 ].
Hemp fibers are considered among the best reinforcements for composite materials due to the elimination of synthetic fibers affecting the environment [ 10 ]. Glass fibers have been used for reinforcing composite materials in windturbine blades and boats, since glass fibers have a lower density than steel but a higher strength
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 Kelvin PDC: Panouri solare