Microwave heating of materials classified
    The dielectric material , reflection and absorption of the material is to determine the principal physical microwave power , when the dielectric constant , the reflectivity is small. Absorption rate is high ; when permittivity hours. Reflectivity on the big , the absorption rate is small.
    According to these characteristics , it is usually the material is divided into four broad categories:
    The first major is a good conductor . Such as copper , lead, silver of a metal , dielectric loss coefficient is extremely small prop mainly reflect the microwave , the same as the specular reflection light . For such substances, the microwave heating effect is not produced .
    Second major category is an insulator such as glass, ceramics , etc., and partially penetrate the microwave reflection and absorption power is extremely small . It to None , and therefore not heated by microwaves .
    The third category is the medium between the metal and an insulator between performance , not only reflected microwave or microwave penetration , but also a microwave absorbing properties. Such substances as water , fat and so on. Different degrees of such media to absorb microwave energy and convert it into heat.
    The fourth category is magnetic compound , very much like the microwave reaction medium . If a magnetic De, the heat generated will be greater , resulting in faster.
    A variety of natural minerals, as the complexity of the ore , the nature of various defects caused by uneven parts , and thus the microwave is generally not show the above-mentioned four types of typical reaction characteristics , even with the same kind are quite different compared to the compound .