Dry ice is solid carbon dioxide with a surface temperature of roughly −78.5°C (−109.3°F), cold enough to cause serious frostbite in seconds. Handling it safely comes down to three things: protecting your skin, keeping the area ventilated, and never sealing it in an airtight container. Here’s everything you need to know to use, store, transport, and dispose of dry ice without incident.
Why Dry Ice Is Dangerous
Unlike regular ice, dry ice doesn’t melt into a liquid. It sublimates, meaning it converts directly from a solid into carbon dioxide gas. This process happens continuously at normal atmospheric pressure, and it creates two distinct hazards. First, the extreme cold can damage your skin on contact, producing injuries similar to a burn. Second, the carbon dioxide gas it releases can displace oxygen in an enclosed space, leading to headache, confusion, disorientation, and in extreme cases, death.
A standard cooler holding 5 to 10 pounds of dry ice will lose that entire amount to sublimation within about 24 hours. That’s a significant volume of CO2 gas quietly filling whatever space the cooler sits in. OSHA sets the workplace exposure limit for carbon dioxide at 5,000 parts per million over eight hours, and concentrations above 40,000 ppm are considered immediately dangerous to life. A few pounds of dry ice sublimating in a small, sealed room can push levels well past those thresholds.
Protective Gear You Need
Never touch dry ice with bare hands, even briefly. Cryogenic gloves are the best option. These are specifically designed for temperatures below −80°C and should fit loosely so you can pull them off quickly if a piece of dry ice falls inside the glove. Thick leather work gloves or heavy-duty insulated oven mitts also work for short handling tasks like transferring blocks into a cooler.
Thin latex, nitrile, or rubber gloves offer almost no protection and can actually make things worse: they trap the cold against your skin. Beyond gloves, wear long sleeves and closed-toe shoes. If you’re breaking up a large block, safety glasses or a face shield will protect against flying chips. Tongs are useful for moving smaller pieces without direct contact.
How to Store Dry Ice
The single most important rule: never put dry ice in an airtight container. As it sublimates, the gas pressure builds inside a sealed vessel until it ruptures or explodes. This includes screw-top containers, sealed plastic coolers with latched lids, and thermos bottles. A standard Styrofoam cooler with a loosely placed lid is ideal because it insulates well while still allowing gas to vent.
Store the cooler in a well-ventilated area, not in a closet, bathroom, or any small room without airflow. A garage with the door cracked open works. If you need to maximize how long the dry ice lasts, fill empty space in the cooler with crumpled newspaper or towels. Less air inside the cooler means slower sublimation. Expect to lose roughly 5 to 10 pounds every 24 hours in a typical cooler, so buy your dry ice as close to the time you need it as possible.
Transporting Dry Ice in a Vehicle
Dry ice should not ride in the passenger cabin of your car. Place it in the trunk or a separate cargo area. If your vehicle doesn’t have a separate compartment (like some SUVs or hatchbacks), crack multiple windows to maintain airflow. The concern is straightforward: carbon dioxide gas is heavier than air, sinks to the lowest point, and accumulates without any visible warning. You won’t smell it or see it.
If dry ice has been sitting in a closed vehicle for more than 30 minutes, open the doors and windows for at least a full minute before getting inside. This lets the accumulated CO2 disperse before you start breathing it.
Using Dry Ice in a Cooler
For keeping food frozen during a power outage, camping trip, or shipment, 5 to 10 pounds of dry ice will hold a standard cooler at freezing temperatures for about 24 hours. Place the dry ice on top of the items you’re keeping cold, since the heavy CO2 gas sinks downward and creates a more even cooling effect. If you’re keeping items cold rather than frozen, layer regular ice or ice packs between the dry ice and the food to moderate the temperature.
Avoid letting dry ice come into direct contact with food that isn’t in sealed packaging. The extreme cold can freeze-damage the texture of fruits, vegetables, and meats, and direct contact can also carbonate liquids, giving them a fizzy, acidic taste.
What to Do if Dry Ice Touches Your Skin
A dry ice burn looks and feels like a thermal burn: the skin turns red, stings, and may blister. The key to treatment is warming the area gradually over 15 to 20 minutes using lukewarm water or gentle moist heat like a heating pad. Don’t use hot water or hold the skin near a flame. Rewarming too fast causes additional tissue damage.
If blisters form and open, apply a thin layer of petroleum jelly and cover the area with clean gauze. Avoid medicated ointments. Seek medical attention if pain gets worse instead of better, if the skin turns gray, yellow, or waxy, or if redness doesn’t improve after rewarming.
If you or someone nearby starts experiencing headache, dizziness, or confusion while working with dry ice in an enclosed area, move to fresh air immediately. These are signs of CO2 buildup displacing breathable oxygen, and the condition worsens rapidly because elevated carbon dioxide triggers faster breathing, which causes you to inhale even more CO2.
How to Dispose of Dry Ice Safely
The simplest disposal method is letting it sublimate on its own. Leave the remaining dry ice in its cooler with the lid loosely open in a well-ventilated area, and it will convert entirely to gas. Outdoors is ideal. A room with open windows works too.
Never put dry ice in a sink, toilet, or drain. The extreme temperature difference can crack pipes and damage plumbing. Don’t throw it in a trash can or dumpster either. These are enclosed spaces where gas accumulates and can cause a container to burst. Never leave unwanted dry ice in an area where children or pets could access it.
Flying With Dry Ice
The FAA allows dry ice on commercial flights, but with strict limits. You’re allowed a maximum of 2.5 kg (5.5 pounds) per package, per passenger. The packaging must vent carbon dioxide gas freely, meaning no sealed or airtight containers. If the dry ice goes in checked luggage, the package must be clearly marked “Dry ice” or “Carbon dioxide, solid” along with the net weight or an indication that it’s 5.5 pounds or less. You’ll also need airline approval before flying, so check with your carrier when you book.