Dry ice shipping

Dry ice shipping is the transport of solid carbon dioxide (CO2) as a refrigerant or commodity by air, which is regulated under IATA Packing Instruction 954 and national/operator variations to manage risks from CO2 gas release and pressure build-up.

Dry ice (solid carbon dioxide, CO2) is commonly used to refrigerate perishable goods, biological materials, and temperature-sensitive products during transport. When shipped by air, dry ice is treated as a dangerous good because it sublimates to CO2 gas, which can displace oxygen and build pressure inside sealed packages. IATA Packing Instruction (PI) 954 governs the air transport of dry ice and sets mandatory packaging, labeling, documentation, and quantity limits. The 2026 IATA updates emphasize venting requirements, clarified weight limits for passenger and cargo aircraft, and reinforced the need to check carrier-specific operator variations and checklists.

Key regulatory identifiers

• Proper shipping name: Carbon dioxide, solid (dry ice).
• UN number: UN 1845.
• Hazard class: Class 9 (Miscellaneous dangerous substances and articles).
• Governing standard for air: IATA Dangerous Goods Regulations, PI 954 (with operator variations).

Venting and packaging requirements

The most critical safety issue with dry ice is gas accumulation. As dry ice sublimates to CO2 gas, pressure can build in completely airtight containers and oxygen levels can fall in confined spaces. To comply with PI 954 and reduce risk:

• Packaging must permit the release of CO2 gas. Use containers or inner packaging that allow venting; avoid sealed metal or airtight plastic drums for shipments that will contain sublimating dry ice.
• Use UN-tested packaging when required by the shipper or operator, and ensure any insulating outer box is compatible with vents or pressure-relief features.
• Include absorbent materials or liners only when necessary for co-packed liquids, but do not attempt to contain or trap CO2 gas.
• Ensure thermal insulation is appropriate for the cargo but not at the expense of preventing gas escape.

2026 weight limits and aircraft restrictions

IATA PI 954 and operator variations distinguish between passenger and cargo aircraft because in-cabin safety considerations differ:

• Passenger aircraft: Generally limited to small net quantities per package — commonly 2.5 kg of dry ice per package for shipments that can travel on passenger aircraft. This low limit recognizes cabin ventilation and crew/passenger safety.
• Cargo-only aircraft: Allow substantially larger quantities per package; many airlines permit up to 200 kg per package under PI 954, but this is subject to airline-specific operator variations and limitations. Some operators impose lower per-package limits or require additional approvals for large loads.

Always verify the applicable limit for the specific flight and operator before tendering a shipment. The 2026 IATA updates reiterated that operator variations can override general PI wording and that shippers must follow both IATA rules and airline-specific checklists.

Carrier variations and practical examples

Major carriers publish operator variations and internal checklists that modify or clarify PI 954 for their networks. Examples include FedEx and UPS, which maintain checklists and specific requirements for dry ice handling. Practical considerations from carrier variations include:

• Prohibitions on using carrier-branded packaging for dry ice shipments — for example, some FedEx checklists (e.g., FedEx FX-06) explicitly forbid the use of FedEx-branded boxes for consignments containing dry ice because of regulatory and liability reasons.
• Different maximum net quantities per package or per AWB for cargo aircraft versus passenger-carrying flights.
• Additional documentation, acceptance checks, or airplane type restrictions (e.g., certain small freighters may not accept heavy dry ice consignments).

Because operator variations change over time and may differ by country or route, shippers must consult the current IATA DGR, the airline’s published operator variations, and carrier-specific hazardous materials checklists before shipping.

Labeling, marking, and documentation

Typical PI 954 requirements and common carrier expectations include:

• Proper shipping name and UN number: "Carbon dioxide, solid (dry ice)" and "UN 1845" where required.
• Class 9 hazard label (miscellaneous) and the dry ice handling label or marking identifying the substance and net weight of dry ice in kilograms on the package.
• Indication on the air waybill and shipper’s declaration where required by the operator or for larger quantities; many carriers require the net weight of dry ice to be shown on the AWB.
• Emergency contact information and any special handling instructions for acceptance and loading crews.

Best practices for compliant dry ice shipping

1. Confirm classification and quantity: Identify the UN number and calculate net weight of dry ice per package. Ensure the amount per package complies with passenger vs cargo aircraft limits and carrier operator variations.
2. Choose appropriate packaging: Use packaging that allows venting. If using insulated boxes, design them to permit gas escape while preserving thermal performance.
3. Label and document accurately: Affix required Class 9 labels, mark net weight of dry ice in kg, and complete all required shipment paperwork and AWB fields.
4. Consult carrier rules: Check the airline’s operator variations and the carrier’s hazardous materials checklists (e.g., FedEx FX‑06, UPS HAZMAT guidelines) and obtain any required approvals for cargo-only shipments over standard limits.
5. Train staff: Ensure all personnel involved in packaging, documentation, and transportation have current dangerous goods training as required by law and by IATA.
6. Plan for emergency response: Provide clear instructions and contacts for handling leaks, oxygen depletion incidents, or regulatory issues on arrival.

Common mistakes and how to avoid them

• Using airtight containers: Never ship dry ice in sealed metal or airtight plastic drums. Always enable venting.
• Failing to check operator variations: Assuming IATA alone covers the shipment can lead to refusals or delays — always verify airline-specific rules and checklists.
• Under- or over-declaring quantities: Incorrect net weight declarations can result in regulatory noncompliance and fines. Accurately weigh and record dry ice per package.
• Incorrect labeling or missing documentation: Omissions can cause shipments to be rejected at acceptance or delayed in transit.
• Inadequate training: Untrained staff may mis-package or mis-document shipments; maintain current dangerous goods training for relevant personnel.

Practical examples

Example 1 — Small clinical sample to a hospital: A packer places biological specimens in an insulated shipper with 2.0 kg net dry ice, ensuring vents are present and labeling the box with Class 9 and "UN 1845" plus the net weight. The shipment meets passenger-aircraft limits and can travel on a combination passenger flight if the carrier accepts it.

Example 2 — Large pharmaceutical shipment: A logistics manager books a cargo-only flight, confirms the airline allows 150–200 kg per package under its operator variation, uses approved vented packaging, records the net dry ice weight on the AWB, and obtains any required airline approvals before tendering.

Summary

Dry ice shipping by air requires strict attention to IATA PI 954, the 2026 updates emphasizing venting and weight distinctions between passenger and cargo aircraft, and carrier-specific operator variations such as FedEx and UPS checklists. Key actions for compliant shipments are to ensure packaging allows CO2 release, verify per-package weight limits for the chosen aircraft type, label and document accurately, consult carrier rules, and maintain current dangerous goods training for staff.