Dry Ice Sublimation
Dry ice sublimation is the direct transition from solid carbon dioxide to CO₂ gas. This process absorbs heat and reduces the mass of dry ice. At normal atmospheric pressure, no liquid CO₂ forms; this distinguishes the process from the melting of a water-based coolant pack.
What affects consumption?
- Heat entering through walls, the lid, joints and openings, as well as the temperature difference from the surroundings.
- The initial temperature and load of the packaging: warm components or products create an additional thermal load.
- The shape, arrangement and exposed surface area of the dry ice, together with the duration and conditions of transport.
Is there a fixed daily consumption rate?
There is no reliable universal percentage or kilogram figure. Suitable quantities are established for the specific dry ice insulated box or complete shipping system. If replenishment is planned, it requires a tested procedure. The CO₂ produced must be able to escape from the packaging; a gas-tight seal is unsuitable.
Related terms: Dry Ice for Deep-Frozen Transport · Dry Ice Shipper
Technical references:
OSHA: Properties and handling of dry ice
FedEx: Packaging for dry ice shipping