Advantage
1. Freeze drying is carried out at low temperatures, for a lot of heat sensitive material for special use, such as protein, microorganism, widely used in the pharmaceutical industry.
2. Low temperature drying, material in some loss of volatile components is small, suitable for some chemical products, medicine and other dry.
3. During the lyophilization process, microbial growth and enzyme function cannot be performed, can maintain the original properties of lyophilized product.
4. Lyophilized product volume, to maintain the original structure, no concentrated phenomenon.
The porous material. After drying, water dissolves quickly and completely.
6. Lyophilization is carried out under vacuum, some easy oxidation of the material is protected.
7. The dried material is not easy to deteriorate.

Disadvantages
Freeze drying equipment (freeze drying machine), the cost is high (high price), operating costs are high, freeze dry product time