Table 4. Mechanical Properties Data of Silica–SBR Compounds according to Extend Oil Content

Hardness (shore A) M100% (kgf/cm2) M300% (kgf/cm2) Elongation at break (%) Tensile strength (kgf/cm2)
O40 55.8 10.4 29.7 1363 258.1
O20 66.7 22.8 71.1 844 274.1
O15 72.0 29.1 94.8 714 296.2
O10 70.7 25.7 85.1 621 243.8