Thermosetting materials are a type of polymer that, once cured or hardened, cannot be remolded or reshaped. This process involves a chemical reaction that creates strong bonds between the polymer chains, making the material rigid and heat-resistant. Common examples of thermosetting plastics include epoxy, phenolic, and melamine. These materials are widely used in various applications, such as electrical insulators, automotive parts, and kitchenware. Their durability and resistance to heat and chemicals make them ideal for products that require long-lasting performance. However, once set, thermosetting materials cannot be recycled or reused in their original form.