Dry ice — solid carbon dioxide at −78.5 °C — moves vaccines, keeps food shipments cold, cleans production lines and fills stages with fog. It is also unusual among industrial consumables in how often it ends up in untrained hands: couriers, caterers, event crews, lab assistants. Handled with a few simple rules it is safe; handled casually it causes cold burns, burst containers and, in enclosed spaces, asphyxiation. This is the practical reference: how to handle dry ice, how to store it, how to transport it and how to dispose of what is left.
Two hazards, not one
Every rule on this page follows from two physical facts about solid CO2.
- It is brutally cold. At −78.5 °C, dry ice causes cold burns on bare skin within seconds, not minutes. Handle it with insulated gloves or tongs, never with bare hands, and wear long sleeves whenever you are moving it in quantity rather than a single block.
- It never stops producing gas. Dry ice does not melt; it sublimates, turning directly into CO2 gas around the clock. That gas is invisible, effectively odourless at the concentrations that matter, and heavier than air: it sinks, pools at floor level and displaces the oxygen you breathe. This is the hazard people underestimate — the suffocation risk in cars, walk-in chillers, basements and cellars.
Cold you notice immediately. Gas you may not notice at all — which is why ventilation appears in every section below.
The rule that saves lives: never seal it
Sublimation does not pause because a lid is shut. Put dry ice in an airtight container — a screw-top bottle, a sealed drum, a cooler latched gas-tight — and the escaping gas has nowhere to go. Pressure climbs until the container bursts, and a glass or plastic bottle bursting under pressure is shrapnel. Burst containers are among the most serious dry ice accidents, and they are entirely preventable: nothing airtight, ever.
This is also why purpose-built dry ice storage containers are insulated but deliberately not hermetic. Thick polyethylene walls slow heat ingress to keep sublimation losses down, while the lid closes snugly without ever being gas-tight, so CO2 escapes instead of accumulating. Insulated and vented is the design principle; sealed is the failure mode.
How to store dry ice
- Use an insulated container in a ventilated space. A garage with airflow, a shaded loading dock or a ventilated cold room works; a sealed office, a closed car or an unventilated cellar does not.
- Never use a domestic freezer. At around −18 °C, a household freezer is far warmer than dry ice, so it barely slows sublimation — and the escaping CO2 fills the cabinet instead.
- Plan for continuous loss. Even in a good insulated box, dry ice shrinks day by day, so set order quantities and delivery timing so that the ice arrives shortly before use. The freshness logistics — and why producers schedule output against demand rather than stockpiling — are covered in our guide to the dry ice production equipment chain.
How to transport dry ice
The storage rules travel with the ice, plus one that is absolute: dry ice rides in a ventilated cargo space, never in the passenger cabin of a car. Sublimation continues while you drive, and CO2 accumulates silently around the people in the vehicle. If a short hop with dry ice inside the car is truly unavoidable, keep it in an insulated, non-airtight container, keep the windows open and keep the trip short.
For air freight, dry ice is classified as dangerous goods under UN 1845. Carriers generally limit the quantity of dry ice per package and require packaging that lets the gas vent, along with specific marking; exact limits and paperwork vary by carrier, route and destination, so confirm them with the carrier before booking rather than assuming.
Dry ice around people and food
Fog effects at events, in cocktails and in food presentation are a legitimate use — with two rules. Pieces of dry ice are never put into a drink that someone will swallow; a swallowed fragment causes internal cold burns. Create the effect in a separate outer vessel, or remove the ice before the drink is handed over. And ventilate any room where fog is being generated: that low white fog is not steam but CO2-rich air rolling along the floor — exactly where children and pets breathe.
How to dispose of dry ice
Leftover dry ice is not thrown away; it is allowed to disappear. Leave it in a well-ventilated area away from people and pets — outdoors or in a space with real airflow — and let it sublimate completely. Never pour it into a sink or toilet: the thermal shock can crack pipes, and the gas can pool in drains. And never put it into a sealed rubbish bin, which is simply the airtight-container mistake in another form.
First aid, briefly
- Cold burn: treat it like a thermal burn. End the contact, warm the area gently with lukewarm — not hot — water, and seek medical help for anything beyond a small superficial patch.
- Suspected CO2 exposure: dizziness, headache or rapid breathing in an enclosed space where dry ice is present means fresh air immediately — get out, get others out and ventilate thoroughly before anyone goes back in.
Safe handling is a short list
Almost everything above compresses into three habits: ventilate, wear insulated gloves, and never seal. Teams that build those three into their daily routine handle tonnes of dry ice for years without incident.
Cryofortune is a sourcing and engineering supplier, not a factory. We deliver dry ice production and handling equipment from a network of vetted Chinese manufacturers — dry ice pelletizers, liquid CO2 equipment, insulated storage containers, dry ice blasting machines — matched to your capacity, climate and market requirements. If you are planning dry ice production or choosing handling equipment, tell us about your project and we will propose a configuration.
Availability and applicability of any standard, certificate, marking or registration procedure is confirmed for the specific manufacturer, model and order before production.
Dry ice storage and handling: common questions
How long does dry ice last in storage?
In a purpose-built insulated container, sublimation runs roughly 2–10% per day depending on container quality, block versus pellets, and how often the lid opens. In an ordinary cooler it disappears several times faster.
What is the best container for storing dry ice?
A thick-walled, non-airtight insulated container designed for dry ice. It must never be sealed gas-tight: sublimating CO2 builds pressure, so the container has to vent while insulating.
Can I store dry ice in a freezer?
No — a household freezer at −18 °C is warm compared to dry ice at −78.5 °C, so it speeds nothing up, and the sublimating CO2 gas becomes a hazard in the sealed compartment.
What are the safety rules for handling dry ice?
Insulated gloves and eye protection, ventilated spaces (CO2 displaces oxygen), never in airtight vessels, and transport in a ventilated compartment separate from the driver.