Question

What is thermosetting plastic?

Answer 1

becoming permanently hard or solidifying when heated; used especially of synthetic plastics such as Bakelite.

Answer 2

Answer:

thermosetting polymer, resin, or plastic, often called a thermoset, is a polymer that is irreversibly hardened by curing from a soft solid or viscous liquid prepolymer or resin. Curing is induced by heat or suitable radiation and may be promoted by high pressure, or mixing with a catalyst. Wikipedia