Storing Dry Ice in a Freezer: Is it Safe?

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Discussion Overview

The discussion centers on the safety of storing dry ice in a normal freezer, particularly regarding the potential risks associated with carbon dioxide accumulation and the effects on air quality. Participants explore the implications of storing 5-10 pounds of dry ice in a 12 cubic foot freezer, including considerations for ventilation and safety precautions.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions the safety of storing dry ice in a freezer, noting the potential dangers of improper use.
  • Another participant explains that dry ice will outgas carbon dioxide, which can create pressure in sealed bags and potentially cause them to burst.
  • Concerns are raised about the accumulation of carbon dioxide in the air, particularly its density compared to air and the risks it poses to pets and children.
  • Further emphasis is placed on the health risks associated with elevated CO2 levels, including adverse effects at low concentrations and severe consequences at higher levels.
  • One participant asserts that even without opening the freezer, CO2 will escape due to pressure buildup, highlighting the need for adequate ventilation in the storage area.

Areas of Agreement / Disagreement

Participants express a range of concerns regarding the safety of storing dry ice, particularly about ventilation and the risks of carbon dioxide accumulation. There is no consensus on a definitive safe practice, as multiple viewpoints on the risks and necessary precautions are presented.

Contextual Notes

Participants discuss the implications of CO2 density and pressure buildup, but there are unresolved assumptions regarding the specific conditions of the freezer and the environment in which it is located.

MACHO-WIMP
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Hello,
is it safe to store approximately 5-10 pounds of dry ice in a normal freezer, because my grandpa came to town today from his elk hunting trip, and he seems to think so. Please comment, because I know that dry ice can be dangerous if used improperly. The dry ice is currently being stored in a freezer with a volume of 12 cubic feet and the dry ice is in plastic bags. Thank you!
 
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It will outgas carbon dioxide, so as long as you can handle that safely you are good to go. If you seal it in a bag, expect the bag to eventually fill up like a balloon and burst. If your freezer has a magnetic seal, expect it to pop the seal if the box is not otherwise vented. If it is a top loader, that will act like a relief valve.

But be sure that you don't get an accumulation in the volume of air that you might breath.
 
"But be sure that you don't get an accumulation in the volume of air that you might breath."

Remember that CO2 is denser then air so any gas will accumulate at ground level, it's probably prudent to keep pets and young children out of the room when opening the freezer.
 
Pkruse said:
But be sure that you don't get an accumulation in the volume of air that you might breath.

And be aware that CO2 levels as low as 0.5% may start to cause adverse effects like headaches, and above 5% can lead to rapid loss of consciousness or even death.

http://www.netl.doe.gov/technologies/coalpower/cctc/EIS/mountaineer_pdf/Appendix_G_Volume2.pdf Table G-1.
 
10 pounds of CO2 in a small kitchen is enough to get more then 5% CO2 in the air. The CO2 will come out of the freezer even if you don't open it because of the pressure it builds up. So make sure there is enough ventilation. Keep the windows open.
 

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