Dry ice should disappear by sublimating into carbon dioxide gas, but the place where that happens matters.
Keep it in a well-ventilated area that people and pets cannot enter. Never use a sealed container, drain, toilet, trash can, or enclosed room.
Let Small Amounts Sublimate Safely
Wear insulated gloves and use tongs for solid pieces. Dry ice is about -109 degrees Fahrenheit and can cause severe frostbite after direct contact.
Set the dry ice on a stable insulating surface in a well-ventilated area where carbon dioxide cannot build up.
Keep children, pets, and other people away. Leave the container loose or vented so gas cannot create pressure.
Wait until every piece is gone. Dry ice does not leave a puddle because it changes directly from solid carbon dioxide to gas.
Places That Are Not Safe
Do Not Use a Sink, Drain, or Toilet
The extreme cold can crack fixtures or piping. Gas pressure may also build inside plumbing.
Do not pour hot water over dry ice in a drain. Leave the area and contact a plumber or fire department if a significant amount is trapped.
Do Not Use a Sealed Container
A sealed jar, cooler, bottle, or glass container can rupture as carbon dioxide accumulates.
An insulated cooler used for temporary holding must allow gas to escape. Never latch, tape, or screw it airtight.
Do Not Leave It in an Enclosed Room or Vehicle
Carbon dioxide is colorless and odorless. It can displace breathable air without giving you a warning smell.
Never leave dry ice in a parked passenger vehicle. Ventilate a cargo area before you reach inside after transport.
Do Not Put It in Household Trash
CDC guidance says not to place dry ice in trash cans or similar containers. The cold and condensation can damage the receptacle.
If Dry Ice Touches Skin
Do not rub the area. Seek medical help for blistering, numbness, severe pain, or a large exposure.
If someone has trouble breathing, becomes confused, collapses, or cannot be awakened, move to fresh air without entering an unsafe space and call 911.
Transporting Dry Ice
Keep transport time short and maintain fresh-air circulation. Never leave dry ice unattended in a passenger compartment.
Air travel has separate rules. FAA limits dry ice used for perishables to 5.5 pounds per package and passenger, requires airline approval, and requires vented packaging.
Tell the airline before travel and follow its packaging and marking instructions. Shipping for business or laboratory work can involve additional hazardous-material rules.
Frequently Asked Questions
How Long Does Dry Ice Take to Disappear?
There is no dependable household estimate. Quantity, piece size, insulation, airflow, and temperature all affect the sublimation rate.
Can You Store Dry Ice in a Freezer?
Do not use an ordinary household freezer as a disposal method. Follow the supplier’s storage directions and arrange the ventilated sublimation route promptly.
Can You Touch Dry Ice With Oven Mitts?
Use insulated gloves intended for cold handling and tongs. Thin or damp kitchen mitts may not provide dependable protection.