Thermosetting polymers are compounds that solidify, or "set," after cooling from the molten state and then cannot be remelted. Some typical thermosetting polymers are the epoxys, alkyds, polyurethanes, furans , silicones, polyesters, and phenolic plastics . Products made from thermosetting polymers include: radio cases, buttons, dinnerware, glass substitutes, paints, synthetic rubber , insulation, and synthetic body parts. Because they cannot be recycled and do not readily decompose, thermosetting polymers pose a serious environmental hazard. They contribute significantly, therefore, to the problem of solid waste disposal and, in some cases, pose a threat to wildlife who swallow or become ensnared in plastic materials.