The shelf life of dry ice depends on various factors, including the form in which it is stored, the ambient temperature and the type of packaging. Dry ice sublimates, which means it transforms directly from a solid to a gaseous state without becoming liquid. The rate of sublimation is strongly influenced by external conditions.
To extend the shelf life, a few precautions should be observed. The dry ice should never be stored in an airtight container, as the pressure of the carbon dioxide gas that forms can cause the container to burst. It is also advisable to check the container regularly and, if necessary, add fresh dry ice to maintain cooling.
The shape of the dry ice plays an important role: dry ice in block form generally lasts longer than in smaller pellets, as a smaller surface area in relation to the volume reduces the sublimation rate. The optimum storage environment is a transport box with a high insulating effect.
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The fact that dry ice sublimates relatively quickly should also be taken into account when planning events or transportation. Anyone wishing to use dry ice for cooling purposes should calculate in advance how much is needed, taking into account the estimated duration of use and the associated conditions.
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