Consider the tensile strength of S-glass from Table 1, and that of
polypropylene (PP) from Table 2 and that of polyester resin from
Table 3, it can be found that the tensile strength of the fiber
(S-glass) is 75–150 times higher than those of the matrices (PP
and polyester resin). It can also be found that the Young’s modulus
of the fiber (S-glass) is 80–160 times higher than those of the
matrices (PP and polyester resin) [3–8].