Fig. 10 shows SEM micrographs of unfilled STR 5L, ENR-
25 and SBR compounds taken at a magnification of 300-x.
The micrographs reveal that the fracture surface exhibits
greater matrix tearing in STR 5L (Fig. 10a) compared to the
ENR-25 (Fig. 10b) and SBR (Fig. 10c) compounds. The
rougher surface observed in the STR 5L compound (Fig. 10a)