Both amorphous and crystalline thermoplastic resins are used in injection molding.
Material selection can be a complicated task.
This schematic illustrates the performance spectrum of a variety of plastic materials. Various additives may be added to injection molding compounds to accomplish various purposes. This table summarizes some of them. The operating temperature must lie in the range between the glass transition temperature and the degradation temperature of the polymer. Some amorphous polymers like polycarbonate have good impact strength.