Which of the following statements is true regarding the characteristics of thermoset polymers?

The statement that thermoset polymers typically retain their shape once set is accurate. Unlike thermoplastics, which can be melted and reshaped multiple times, thermoset polymers undergo a curing process that creates a rigid structure. During this curing, a chemical change occurs, resulting in a cross-linked network of polymers that solidifies into a strong, inflexible material. This unique characteristic means that once thermosets are set, they cannot be remelted or reshaped, ensuring that they maintain their shape and properties throughout their use. This resistance to deformation under heat or stress makes thermosets ideal for applications requiring durability and dimensional stability.

In contrast, the other statements do not accurately represent the properties of thermoset polymers. They do not allow for reshaping, are typically rigid rather than flexible, and generally do not exhibit high ductility compared to other materials. These factors contribute to the distinct role of thermosets in various manufacturing applications.