Primary Drying
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temperature may be raised to encourage the
sublimation process.

The Primary Drying stage will result in a final residual
moisture content of 3 to 5%. If a lower moisture
content is required, then secondary drying is added.

Primary Drying attempts to achieve an ice interface
temperature below the melting or critical
temperature, but close enough to encourage
sublimation at the fastest rate possible
(IE: Tice = Tcritical - 5°C).

Each step of primary drying includes a shelf
temperature set-point and a vacuum control level.
This step may hold the temperature or ramp between
two temperatures at a defined rate.
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