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Conservation of Artefacts with Freeze Drying

Martin Christ The Archaeological Findings Freeze Dryer from John Morris Vacuum

Conservation of cultural objects in museums and libraries

Archaeological objects are often saturated with water when they are recovered, for example from damp soil, bodies of water, sunken ships and so on.

Historical documents in archives or museums frequently become soaked with water from burst pipes, flooding or fire.

Martin Christ Conservation freeze dryer for Archaeological objects from John Morris Vacuum

Special freeze dryer for Archaeological objects, such as Viking dugout

To protect these objects against fungal growth and resulting damage, they are first frozen in freezing chambers or by other means. Afterwards they can be freeze dried bit by bit in special drying systems. This virtually eliminates harmful effects, such as corrosion of metallic parts or, in the case of documents, washing out of the ink, sticking together of individual pages, or leaching of printing ink. As a result, the documents remain legible. Sublimation is accelerated by energy input from heated shelves and a vacuum level near the triple point of water, such as 3 hPa. The drying times range from several days to a few weeks due to the thickness of the objects.

To find out more about Martin Christ Freeze Dryers,
please contact our Vacuum experts
Email: vacuum@johnmorris.com.au or
Free call AUS. 1800 251 799 and NZ  0800 651 700

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