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Novel, 28 kV, thermoplastic elastomeric (TPE) insulators were tested under IEC 1109 5000h (Annex C) conditions (slightly modified) for their long term performance. The modifications were made to more closely simulate the actual service environment. Various stresses applied include UV-A radiation, heat, rain, clear mist and salt fog, in addition to electrical. The insulators performed well showing only superficial changes that maintain the integrity of the material and the functionality of the insulator, just like in service where these insulators serve for several years. It was proven again that multistress tests more closely represent the ongoing synergy of various services in the field.