Actual Problems in Machine Building. Vol. 13. N 3-4. 2026 Materials Science in Machine Building ____________________________________________________________________ 70 USE OF HIGH-TEMPERATURE POLYMER MATERIALS IN THE MANUFACTURE OF ELECTRICAL APPARATUS Tatanov P.V., Post-graduate Student, e-mail: tatanov@list.ru Platonov D.O., Student, e-mail: danil.platon.2024@mail.ru Petrov V.N., Ph.D. (Engineering), Associate Professor, e-mail: pvn.chuvsu@yandex.ru I.N. Ulyanov Chuvash State University, 15 Moskovsky Prospekt, Cheboksary, 428015, Russian Federation Abstract This study systematizes and comparatively analyzes the thermal characteristics of polymeric materials used in the design of low-voltage electrical apparatus (EA). Based on a critical review of recent Russian and foreign literature, the authors classify eight principal heat sources affecting polymeric components in EA: electric arc, overload currents through bimetallic strips, ohmic (resistance) heating of electromagnet coils, elevated contact resistance, external heating from emergency conductors, tracking, contact metal deposition on insulating surfaces, and impaired cooling conditions. A comparative assessment methodology based on maximum sustained and short-term operating temperature criteria was applied to seven grades of thermosetting plastics and thirteen grades of high-temperature thermoplastics. The analysis demonstrates that conventional thermosets (phenolics, aminoplasts, glass-fiber reinforced compounds) provide sustained heat resistance only within the range of 110–160 °C with short-term peaks up to 200 °C, whereas hightemperature thermoplastics (PPS, PEEK, PAI, LCP, PI, PBI) can sustain continuous operation at 180–400 °C and can withstand short-term heating up to 500 °C. The authors propose a classification of high-temperature thermoplastics into three operational temperature ranges corresponding to typical EA service conditions. The study concludes that transitioning to high-temperature thermoplastics enables increased load-bearing capacity of apparatus without dimensional changes, eliminates thermosets from the manufacturing cycle, reduces material and labor costs, and enables recycling of production waste in accordance with circular economy principles. Keywords electrical apparatus, high-temperature polymers, thermosets, thermoplastics, heat resistance, heat sources, polyphenylene sulfide, polyether ether ketone, polybenzimidazole, material consumption reduction.
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