The tensile strength vs. modulus properties of various natural fibers are compared to those of conventional fibers for PP reinforcement (sgf/lgf, scf) in Fig. 3-1 and Fig. 3-2 in terms of absolute properties and specific properties, respectively. The data for the various fiber types and grades were taken from the references indicated in Table 3-1 and, in the case of the natural fibers, represent dry fiber conditions.