What type of material cannot be softened or reshaped after curing?

Thermoset materials are characterized by their chemical structure, which becomes permanently set during the curing process through a chemical reaction. Once fully cured, these materials cannot be softened or reshaped by the application of heat. This property makes thermosets ideal for applications that require high structural integrity and resistance to deformation under varying temperatures.

In contrast, thermoplastic materials can be reheated and reshaped multiple times, allowing for flexibility in manufacturing and recycling. Elastomeric materials, which also include rubber-like qualities, can be stretched and returned to their original shape but retain some degree of flexibility and can be reshaped under certain conditions. Composite materials consist of two or more constituent materials that are combined to enhance certain properties, and depending on the components used, they may not share the same rigid capabilities as thermosets.

Understanding these distinctions is crucial for fire inspectors and materials professionals, as the properties of materials significantly impact their application in fire safety and building construction.