<p>Most of the elastomeric components such as mounts, seals, gaskets, and liners are subjected to harsh environmental conditions, hence it demands materials with multifunctional property balance of mechanical strength, thermal and chemical resistance, which can achieved remarkably by ternary elastomeric composites than single and binary blend elastomeric composites. Hence, in this work, an attempt is made to develop novel ternary elastomeric composites by selecting three elastomers, namely nitrile-butadiene rubber (NBR), chloroprene rubber (CR), and epoxidized natural rubber (ENR), primarily based on their solubility parameters and application requirements. These composites can be conventionally cured using either sulfur or peroxide. To study the effect of these curing systems and to determine the optimum content of elastomers, different composites were developed following a simplex centroid mixture design approach. Accordingly, seven composites of each set of curing were developed and studied for their mechanical, thermal, and swelling behaviors. By adopting grey relation analysis (GRA), the optimum content of elastomer based on mechanical properties is determined. To support the findings, morphological and FTIR studies were also carried out. Further to evaluate the chemical resistance and thermal stability of the prepared composites, swelling studies and thermal degradation studies were also carried out respectively.</p> Graphical abstract <p></p>