University Archives
ARCHIVES AND LIBRARY DISASTER PLAN


VACUUM FREEZE DRYING

Vacuum freeze drying is a safe and effective method of treating sublimates directly from the frozen state to a vapour. Freeze drying kills active mould and causes dormancy in spores.

Vacuum drying, which is different from Vacuum freeze drying, should not be used for archival material, rare books or photographs.

It is important to partially thaw distorted items and reshape before vacuum freeze drying. Items will retain the same shape

Materials should be kept frozen and left in their transport boxes for the process.

If the vacuum freeze drying facilities are over 30 minutes away, transport materials in freezer trucks. Refrigerated trucks are highly recommended if mould growth and time are significant factors.

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