In this work, the effect of incorporation of ATH and Kaolin as a filler on mechanical properties of vulcanizates of ethylene-propylene diene monomer (EPDM) compounds have been studied. The presented compounding formulation was selected based on a typical application of EPDM products in medium to high-voltage cover insulators. The properties of the EPDM rubber loaded with different ratio of ATH/kaolin were evaluated with mechanical properties including tensile strength, modulus, hardness and crosslink density. Results showed that the the tensile modulus, hardness and crosslink density were increased by increasing the ratio of ATH in EPDM composite samples. In addition, elongation at break and tensile strength were decresed by increasing of ATH/kaolin ratio, probably due to lower compatibility of polymer and filler in higher filler contents of ATH. To select appropriate content of hybrid filler of ATH/kaolin, other properties such a electrical and insulation specifications should be considered by application of EPDM composites in practical interesting usage field.

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