AbstractThis paper describes the results of an experimental investigation concerning the effect of reactive organofunctional unsaturated silanes on mechanical properties of mineral‐filled ethylene–propylene elastomers. The tested group of the unsaturated silanes was prepared by hydrosilylation syntheses. The experimental silanes, 2,6‐octadienyltriethoxysilane,cis‐2‐butenyltriethoxysilane, 2‐(3‐cyclohexenylethyl)triethoxysilane, and 2‐(3‐cyclohexenylethyl)methyldiethoxysilane, led to a considerable improvement in mechanical and electrical properties of mineral‐filled vulcanizates based on peroxide‐cured ethylene–propylene elastomers. From the tested silanes, the 3‐cyclohexenylethylsilanes impart an improvement comparable with the action of vinyltris(2‐methoxyethoxy)silane, presently used as a standard coupling agent in mineral‐fil