ISSN (online): 2456-8651 International Journal of Engineering Science Technologies May 2020, Vol 4(03), 13 – 18 DOI: https://doi.org/10.29121/IJOEST.v4.i3.2020.82 © 2020 The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. 13 EVALUATION OF DIELECTRIC STRENGTH OF EPDM ELASTOMER LOADED WITH ATH FILLER Tamer Sheta 1 , A.Hossam Gad 2 , L.S. Nasrat 3 , S.M. El-Debeiky 4 1, 2, 4 Electrical Power and Machines Eng. Dept, Ain-Shams University, Egypt 3 Electrical Power and Machines Eng. Dept, Aswan University, Egypt DOI: https://doi.org/10.29121/IJOEST.v4.i3.2020.82 Article Type: Research Article Article Citation: Tamer Sheta, A.Hossam Gad, L.S. Nasrat, and S.M. El-Debeiky. (2020). EVALUATION OF DIELECTRIC STRENGTH OF EPDM ELASTOMER LOADED WITH ATH FILLER. International Journal of Engineering Science Technologies, 4(3), 13-18. https://doi.org/10.29121/IJOEST.v 4.i3.2020.82 Received Date: 28 April 2020 Accepted Date: 18 May 2020 Keywords: EPDM Elastomer ATH Filler Dielectric Breakdown Strength Thermal Aging ABSTRACT Ethylene Propylene Diene Monomer (EPDM) electrical properties are improved by adding Alumina Trihydrate (ATH) filler. Composite of EPDM with ATH filler are prepared with 10%, 20%, 30% and 40% percentages of concentration. The dielectric strength of the composite samples are tested under various thermal conditions such as (25, 70,100 and 130) ᵒC to simulate the various types of climates and clarify the effect of high temperature on the electrical properties of elastomers. Composite samples were exposed also to different climate conditions such as wet and salt. The obtained results of the composite performance are analyzed and discussed in the light of the variations of the material microscopic structure. 1. INTRODUCTION Insulating materials made from porcelain have more than a century of service, while insulating materials made from polymers have only several decades. Nowadays the usage of polymers has been increasing every time due to the enormous advantages of polymers over porcelain and ceramics such as follows: Breakage, Ceramics are very fragile; this means that ceramics can be broken easily in transit, handling or installation. Weight, Porcelain bodies are very massive due to the dense nature of ceramics, which lead to difficulty in handling and transportation, especially on replacement during maintenance and repairs in addition to high cost [1]. The usage of polymers insulators began since 1940s when organic insulators materials were used to product high voltage electrical insulators from epoxy resins. The insulators made from polymers material became applicable to use for outdoor insulators in 1950s because of alumina trihydrate filler that participated in increasing the tracking and erosion resistance of polymers. The real use of polymers was in 1960s and 1970s when many researches were