The main freeze drying processes are:
With this configuration the product is frozen inside the ice condenser chamber and then dried. This method is particularly suitable for substances with low freezing points or thermally unstable substances. In this method, the shelves are located directly in the ice condenser chamber. Freezing can also be assisted by a fan. A stoppering device for vials may optionally be used.
With this configuration the product is separately pre-frozen and then dried above the ice condenser chamber. This method allows a large variety of accessories to
be used. An intermediate valve can be used to separate the product chamber from the ice condenser chamber for the pressure increase test to determine the drying endpoint.
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