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Thermoset materials are known for their ability to withstand heat without melting, which is a defining characteristic of this type of polymer. When thermosets are cured through a chemical process, they form irreversible bonds that give them structural integrity and heat resistance. Rather than melting when exposed to high temperatures, thermosets may become charred or degrade, but they maintain their shape and do not flow like thermoplastics, which melt upon heating.

This characteristic makes thermoset materials highly suitable for applications that require durability and stability under thermal stress, such as in some electrical and automotive components. Their ability to retain structural integrity under heat distinguishes them significantly from other materials that might deform or melt.