Dry Ice: A Critical Guide to Its Risks and Logistics in International Shipping
—— A Focus on Shipping Dry Ice from China
Introduction
As a leading international freight forwarder based in Shenzhen, China, we handle countless shipments moving from China to global markets. A common item we encounter, especially in temperature-sensitive logistics like vaccine, food, or high-tech component transport, is dry ice. While incredibly useful, it is a hazardous material that demands strict adherence to international regulations. This guide, written from the perspective of logistics professionals, aims to inform overseas buyers, shippers, and the public about the critical safety and compliance aspects of shipping goods with dry ice.
1. What is Dry Ice? Understanding the Hazard
Dry ice is the solid form of carbon dioxide (CO₂). Despite its common name, it is not "ice" and poses significant dangers that go beyond simple refrigeration.
Key Risks:
- Suffocation Hazard: Dry ice sublimates (transitions directly from solid to gas), expanding up to 1000 times in volume. In confined, poorly ventilated spaces like containers, vehicle holds, or storage rooms, the released CO₂ gas can displace oxygen, leading to rapid asphyxiation.
- Explosion Hazard: Storing dry ice in sealed, non-vented containers (e.g., certain plastic bottles, glass jars) can cause pressure to build up until the container ruptures explosively.
- Cryogenic (Extreme Cold) Burns: With a surface temperature of -78.5°C (-109.3°F), direct skin contact with dry ice causes severe frostbite and tissue damage almost instantly.
2. Regulatory Classification: It's a Dangerous Good
From a logistics and regulatory standpoint, dry ice is classified as a Dangerous Good (Hazardous Material):
- UN Number: UN 1845
- Proper Shipping Name: CARBON DIOXIDE, SOLID or DRY ICE
- Hazard Class: Class 9 (Miscellaneous Dangerous Substances and Articles)
Crucial Distinction: While gaseous or liquid carbon dioxide (UN 1013, UN 2187) is listed in many chemical inventories, dry ice (UN 1845) is specifically regulated under transportation codes. Compliance is non-negotiable for safe and legal transport.
3. International Transport Requirements: Air vs. Sea
General Requirements (Applicable to all modes):
- Packaging: Must be robust, crush-resistant, and designed to vent CO₂ gas to prevent pressure buildup. Polystyrene (EPS) boxes with vent holes or specialized dry ice containers are standard.
- Ventilation: Transport units and storage areas must be well-ventilated.
- Marking & Labeling: Outer packages must display the Proper Shipping Name ("DRY ICE" or "CARBON DIOXIDE, SOLID"), UN 1845, Class 9 hazard label, and the net quantity of dry ice in kilograms.
A. Air Freight Specifics (IATA DGR):
Air transport is governed by the International Air Transport Association's Dangerous Goods Regulations (IATA DGR). Key rules under Packing Instruction 954 include:
- Quantity Limits: The net weight of dry ice per package is typically limited (commonly 200kg for cargo aircraft). The total dry ice allowed on an aircraft is determined by the airline, based on aircraft manufacturer service bulletins (e.g., Boeing SLs, Airbus WISE documents).
- Documentation: The Air Waybill and Shipper's Declaration for Dangerous Goods must be completed accurately, stating the net quantity of dry ice per package.
B. Ocean Freight Specifics (IMDG Code):
Sea transport follows the International Maritime Dangerous Goods (IMDG) Code. Key considerations:
- Stowage: Requirements vary depending on whether dry ice is the primary cargo or used as a refrigerant for other goods.
- Marking: Special warning marks (e.g., "CO₂, SOLID AS A REFRIGERANT") with specific minimum dimensions (e.g., 250mm x 250mm) are required on freight containers when dry ice is used as a cooling agent.
4. Safe Handling & Packaging for Shippers
- Personal Protective Equipment (PPE): Always wear insulated (cryogenic) gloves and safety goggles. Never handle with bare hands.
- Work Area: Use only in well-ventilated areas. Never in confined spaces like walk-in freezers or sealed car interiors.
Conclusion
Dry ice is an effective cooling agent but treating it as ordinary ice is a dangerous mistake. Successful international shipping requires recognizing it as UN 1845, Class 9 and rigorously following the IATA DGR (for air) or IMDG Code (for sea).
Partner with Experts: As your freight forwarder, we ensure your dry ice shipments are correctly classified, packaged, documented, and declared. This proactive compliance safeguards your supply chain and ensures the smooth movement of your temperature-critical goods from China to your destination.