Shell-freezing & filter bottles

There are several things to consider when freeze-drying bottles hanging on a laboratory freeze dryer.

The product must first be frozen externally before being connected to the freeze dryer via a rubber valve. Each container may then be switched on or off individually. If liquids are to be dried in flasks in a layer more than 1cm thick, then we recommended using a shell- or freeze- spinning arrangement in a cooling bath. The liquid is spread on the inner walls of the flask by rotation where it freezes. This process considerably reduces overall drying time.


Filter bottles, which come in various different sizes, are recommended to reduce the risk of cross-contamination. These have the added benefit of reducing product loss during the freeze drying process. Filters should preferably be changed between each use. Safety nets are also available to reduce the risk of bottle damage.

All products described in this section can be found in our product catalog under documentation.