A susceptor's a material used for its ability to absorb electromagnetic energy. This energy's typically radiofrequency or microwave radiation used in industrial heating processes, and also occasionally in microwave cooking. The name's derived from susceptance, an electrical property of materials that measures their tendency to convert electromagnetic energy to heat. In microwave cooking, susceptors are built into paper packaging of certain foods, where they absorb microwaves which penetrate the… (More on Susceptor)