In this works, the effects of the hardness on the stress relaxation behaviour of EPDM rubber at the room temperature were experimentally investigated. EPDM rubber show outstanding heat, ozone and weather resistance and has excellent electrical properties. Therefore this rubber as an elastomer is an engineering material that has wide range of applications in industry such as door and window seals, radiator, garden and heating hoses, tubing, washers, belts, electrical insulation, roofing membrane and rubber mechanical goods. In the study, stress relaxation experiments were carried out for different loading programs by using EPDM specimens having different hardnesses. In addition, for the loading programs that were implemented, it is shown that for the EPDM rubbers tested the stress relaxation curves obtained at different stretch ratios may be represented by a single representative curve for the specimens having the same hardnesses.
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