What is a key characteristic of thermosetting polymers?

A key characteristic of thermosetting polymers is their ability to maintain shape once set. Unlike thermoplastics, which can be reheated and reshaped multiple times, thermosetting polymers undergo a chemical change during the curing process. This means that they form a rigid structure that is set permanently. Once a thermosetting polymer is molded and cured, it cannot be remelted or reshaped; the cross-linking of polymer chains creates a stable form that can withstand heat and mechanical stress.

This property is particularly useful in applications that require materials to retain their shape and strength under high temperatures or varying environmental conditions. The durability and rigidity of thermosetting polymers make them ideal for use in electrical insulations, adhesives, and various composite materials.