Abstract Rubber blending has been widely used to improve various properties in finished rubber products. The purpose of this paper is investigate the effect filler size, type, concentration, and surface treatment on mechanical, swelling, dielectric, morphology ethylene propylene diene (EPDM)/styrene-butadiene (SBR) blend nanocomposites filled with alumina (Al 2 O 3 ) nanoparticles. Bis-(3-(trie...