The rubber compounds were mixed using a two-roll mill (Kadara Seisakusho model R11-3FF) at a temperature of about 70°C. Each batch was mixed on the two-roll mill for about 30 minutes. The mixed compounds were then cured using a hydraulic compression-moulding machine (Carver Laboratory Press model 2625) at 150°C with the pressure of 16,500 pounds. The curing times, as shown in Table 2, were previously obtained using a Monsanto oscillating disk rheometer (ODR), model MDR 2000. The products in the form of rubber sheets were cut using a specimen-punching machine (Wallace Test Equipment, UK). These specimens were used for hardness and tensile tests. The compressed rubber compounds in the form of cylindrical products were used for abrasion resistance testing. In order to study fracture surface morphology, the products were also investigated under a scanning electron microscope (JEOL JSM T-220A).