There are many kinds of materials which are suitable for grain dryer, usually we classify the materials on the basis of materials and contact ways with water. Materials can be divided into three kinds based on this classification, here are the details:

1. The capillary porous materials. The moisture of this material is mainly contained inside of the materials by capillary action, such as sand, silica, active carbon, biscuit firing ceramics, which has less intensity and material moisture, and it is relatively simple for grain drying machine.

2.The colloidal materials. The contact between this material and water is dominated by soak, such as rubber, flour, which usually reflects high viscosity, larger contact intensity of water and materials, and it is more difficult for the grain dryer.

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