The ethylene-propylene-diene rubber (EPDM) and acrylonitrile butadiene rubber (NBR) are not miscible with each other. In this research, the effect of some materials to create compatibility was investigated and compared. The effect of ultrasil silica (VN3), methyl methacrylate butadiene styrene (MBS), montmorillonite (MMT), and maleic anhydride (MA) on rheometric behavior and mechanical properties such as handness, elongation at break, tensile strength and tear strength of rubber blends of 50/50 NBR/EPDM were evaluated. Rubber compounds with sulfur curing system were mixed by two-roll mill blend and vulcanized at 155°C for about 8 minutes using compression molding operation at 10 MPa. Results showed that the NBR/EPDM blends with MA had the tensile strength 1.3 MPa and elongation at break 316% as the poorest performance. The VN3 silica-based compounds achieved the highest tensile strength and tear resistance about 12.5 MPa and 43.3 kN/m, respectively. For application of NBR/EPDM blend in some rubber industires, the silica could be as potensial compatibilizer to obtain good echanical properties.

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