Several main factors should be taken into accountwhen designing the composites made of RH and PP.Poor compatibility between the hydrophilic fibres andthe hydrophobic thermoplastic matrix leads to the poor dispersion of the fibres into the matrix. This is because, the strong hydrogen bonds exist between thefibres, hold them together. The result is a weak inter-face that cannot efficiently transfer stress to the fibre.Therefore, coupling agents are required to enhancethe interaction between natural fibres and hydropho- bic thermoplastic matrices [5-12]. On the other hand,the hydrophilic nature of the fibres makes them verysensitive towards water absorption which decreasesthe mechanical properties to a great extent. Therefore,the fibres must be dried before being processed.