Dry Ice Marking: How To Prepare Packages For Air, Sea And Road Transport

Dry Ice Marking A package marking identifying dry ice used as a refrigerant; dangerous-goods rules may require additional information such as the proper shipping name, UN number, and net quantity.

This guide walks fulfillment and warehouse teams through the steps needed to prepare packages containing dry ice so they meet carrier and regulatory requirements. Proper marking is the visible part of a compliance workflow that also includes correct packing, documentation and carrier notification.

Step 1: Identify When Dry Ice Is Present

If you add dry ice to any package to maintain temperatures, the shipment is treated as a dangerous good. Track dry ice use per order so every box that contains it is processed through the hazmat flow: marking, documentation, and carrier-specific checks.

Step 2: Apply The Required Markings

The minimum visible elements are the proper shipping name, the UN number and the net quantity. Place the marking on the largest surface of the package near other shipping information. Use clear, contrasting print at a size that remains legible throughout transit.

• Proper Shipping Name: For example, "Carbon Dioxide, Solid" or commonly "Dry Ice."
• UN Number: Always include "UN 1845."
• Net Quantity: Record the weight of dry ice in the package (air transport commonly expects kilograms).
• Handling Statement: Add carrier-required statements such as "This package contains dry ice. May produce carbon dioxide gas; ventilate if opened." where required.

Step 3: Pack To Prevent Pressure Buildup And Asphyxiation Risks

Use packaging that allows gas to vent; do not use fully sealed rigid containers. Insulate product from direct contact with dry ice to avoid freezing damage. Ensure the outer package and internal cushioning can withstand expected handling without crushing the dry ice or the product.

Step 4: Document The Shipment Correctly

Complete the dangerous-goods declaration and the carrier’s required paperwork. The marking on the package must match the description on the transport documentation. For air shipments, the shipper's declaration for dangerous goods is often required; sea shipments require the IMDG description.

Step 5: Verify Carrier Limits And Notify The Carrier

Airlines and some couriers restrict per-package and per-consignment quantities of dry ice and may require prior approval. Confirm those limits before creating the shipment and notify the carrier if required. Failure to do so can lead to refusal or forced rework at the terminal.

• Airlines: Typically require net quantity on each package and limit amount per package and per consignment.
• Couriers/3PLs: May require a hazardous-materials acceptance check at drop-off and special scanning or routing.
• International Shipments: Check import-country restrictions that could affect acceptance.

Who Must Do What In A Fulfillment Operation

Packer: Weigh and record the net quantity of dry ice placed into each box and apply the correct marking. Shipping clerk: Prepare the transport documentation and confirm carrier acceptance. Warehouse manager: Train staff, maintain label stock and monitor carrier rule changes.

Common Mistakes And How To Avoid Them

• Omitting Net Quantity: Always calculate and label the exact net weight of dry ice used.
• Sealing Packages Tightly: Use vented packaging or designs that allow gas escape to prevent pressure hazards.
• Using Faded Labels: Use durable materials and place labels where they won’t be scuffed by palletization or strapping.

In short, the Dry Ice Marking is part of a sequence of actions—identification, correct labeling (proper shipping name and UN number), net quantity recording, appropriate packing and carrier notification—that together keep shipments compliant and safe in air, sea and road transport.