Thermosets and Thermoset Materials

Thermosets and thermoset materials are crosslinked polymers that are cured or set using heat or heat and pressure. Cured thermoset resins may soften when heated, but do not melt or flow. They generally have a higher resistance to heat than thermoplastics. Vulcanization is a thermosetting reaction that uses a crosslinked compound or catalyst. In rubber-like materials, vulcanization results in greatly increased strength, stability, and elasticity. Traditionally, sulfur is used as the vulcanizing agent for natural rubber. Thermosets and thermoset materials may contain filler materials such as powders or fibers to provide improved strength and/or stiffness. Fibers can be either chopped or wound, and commonly include glass, fiberglass, or cloth. Some products contain solid lubricant fillers such as graphite or molybdenum disulfide. Others contain aramid fibers, metal powders, or inorganic fillers with ceramics and silicates.