Freeze-drying works by freezing the material and then reducing the surrounding pressure to allow the frozen water in the material to sublimate directly from the solid phase to the gas phase.

Freeze drying main advantages:

  • Freeze dried products can be stored at ambient temperature
  • Less damage to the substance than other dehydration methods using higher temperatures : in particular color and shape 
  • Does not usually cause shrinkage of the material being dried (no volume reduction)
  • Freeze drying, as processing frozen product can be carried out all year long (no seasonal effect) 

Pump temperature

Low

Heavy duty operation (cycles)

Medium

Dust / Powder / Particules

Low

Moisture

High