Containerized maritime dangerous goods refer to items being transported that are flammable, explosive, or inherently toxic, corrosive, or oxidizing, and that may cause harm to human health and property. Shipping dangerous goods for export in containers involves an additional set of compliance requirements compared with ordinary cargo, including loading rules, markings, lists, and container stuffing inspections. This article explains key points for loading dangerous goods into containers, including compliance with rules, loading methods, mixed-loading restrictions, markings and documentation, and container stuffing inspections. For the classification system of dangerous goods, see Dangerous Goods Classification: Classification Standards for the Nine Major Classes of Dangerous Goods; for an overall introduction to the IMDG International Maritime Dangerous Goods Code, see Dangerous Goods Container Transport: IMDG Code, Markings and Signs, and Declaration Requirements; for requirements for securing and lashing cargo in containers, see Cargo Stowage and Securing: CSS Code Rules and Lashing and Securing Specifications.
I. First, understand and comply with loading rules
When loading dangerous goods into containers, you should first understand and comply with the regulations of the country where the destination port is located, as well as internationally accepted requirements such as the International Maritime Dangerous Goods Code (IMDG Code). Ports and shipping companies on different routes vary in their acceptance policies, space review, and documentation requirements for dangerous goods. Before booking, you should confirm with the carrier the nature of the goods, hazard class, markings, loading method, packaging containers, and measures to be taken in the event of an accident. In addition, you also need to check the dangerous goods operating regulations of the ports of loading and discharge.
II. Container Inspection Before Loading
Before loading dangerous goods, first check whether the strength and structure of the container are suitable for loading such dangerous goods, and thoroughly clean the container to ensure that there are no residual goods and no damage inside or outside the container. During loading, it must be ensured that the dangerous goods will not move, overturn, impact, rub, be crushed, leak, or cause other risks. Materials selected for securing the goods should have a greater safety factor and strength. No part of the dangerous goods may protrude outside the container.
During the loading and unloading of dangerous goods, throwing, dropping, bumping, falling, and rolling are strictly prohibited; collisions and friction between goods must be avoided, and attention must be paid to the protection of operators.
III. Restrictions on Mixed Loading
Different types of dangerous goods shall be prohibited from being mixed in the same container, and in principle, only dangerous goods of the same class shall be loaded in the same container. However, even for dangerous goods of the same class, it is advisable to load only the same variety—because dangerous goods of the same class but different varieties may still interact and cause danger.
When dangerous goods and non-dangerous goods may interact to cause danger, they shall not be loaded in the same container. When dangerous goods are mixed with general cargo, the dangerous goods should be placed near the container doors so that they can be handled conveniently in the event of an accident. Specific segregation requirements shall be subject to the IMG Code and the shipping company's regulations.
IV. Markings and Dangerous Goods List
Markings: For containers loaded with dangerous goods, the classification name and markings of the dangerous goods shall be displayed in an easily visible position on the outer surface of the container. The pattern and shape shall be conspicuous, and dangerous goods markings that comply with internationally uniform regulations shall be used.
Dangerous Goods List: The packer shall prepare, on a per-container basis, and submit to the carrier one copy of the "Container Dangerous Goods List", and shall note on the list the regulatory requirements for the dangerous goods, such as the receptacles, packaging, markings, and loading methods. The recorded items usually include: container number; names (titles) and addresses of the consignor and consignee; classification, item, variety, name of the dangerous goods, and names of receptacles and packaging; number of packages and weight or volume of the dangerous goods; container packing inspection records, etc.
V. Container Packing Inspection and Declaration
According to the relevant regulations on the declaration of foreign trade dangerous goods carried by ships, whenever a ship carries the following dangerous goods into port or in transit, the carrier or its agent shall, at the time of declaration, provide the cargo characteristics, safe operation precautions, personnel protection, and other relevant information: radioactive substances; infectious substances; new organic peroxides; articles “not otherwise specified” in the International Maritime Dangerous Goods Code; bulk liquid chemicals.
Where dangerous goods are transported in containers, a Container Packing Certificate issued after on-site inspection by a container packing inspector qualified by the port supervision authority (maritime department) shall be submitted. The certificate shall be filled out by the on-site container packing inspector in duplicate; the original shall be submitted before the container is loaded onto the ship, and the copy shall be delivered to the carrier when the container handover is processed.
Data Note: The above loading requirements are general industry practices; specifics shall be subject to the current International Maritime Dangerous Goods Code (IMDG Code), the country of the destination port, and the shipping company’s confirmation for the specific booking.
📖 Further Reading: Dangerous Goods Container Transport: IMDG Code, Marking and Placarding, and Declaration Requirements—IMDG general framework; Classification of Dangerous Goods: Classification Standards for the Nine Classes of Dangerous Goods—dangerous goods categories; Special Cargo Ocean Shipping: Guide to Dangerous Goods, Oversized Cargo, and Refrigerated Cargo—overall guide to special cargo; Cargo Stowage and Securing: CSS Code Rules and Lashing and Securing Specifications—in-container securing requirements.
Need to arrange a dangerous goods container export? Bofeng Logistics can, based on shipping schedules and carrier policies, verify dangerous goods booking, documentation, and container packing requirements for you and arrange FCL/LCL shipping solutions. Submit an inquiry online, or call 13075678958 for consultation.
Contact Information: 13075678958 | info@zhbfwl.com
Frequently Asked Questions (FAQ) About Loading Dangerous Goods Containers
Q: Can dangerous goods be loaded in the same container as general cargo?
A: In principle, no. Different types of dangerous goods are prohibited from being mixed; even dangerous goods of the same class but different kinds may create hazards if they come into contact with each other; dangerous goods and non-dangerous goods that may interact with them must also not be transported in the same container. When it is truly necessary to stow them in the same container as general cargo, the dangerous goods should be placed near the container doors to facilitate emergency response. Specific segregation requirements are subject to the IMDG Code and the shipping line's rules.
Q: Why is a "Container Packing Certificate" required for shipping dangerous goods containers?
A: This certificate is issued by a qualified container packing inspector after an on-site inspection, and serves as proof that the dangerous goods have been packed in the container in accordance with the rules. The original is usually submitted to the maritime authority before loading, and a copy is handed to the carrier along with the container to verify the loading and declaration details. It is one of the important documents for compliance in dangerous goods ocean shipping.
Disclaimer: This article was compiled and written by the Bofeng Logistics team, and its content was verified in September 2026. Maritime transport of dangerous goods involves international rules and national regulations; loading, segregation, and declaration requirements are subject to the current International Maritime Dangerous Goods Code (IMDG Code) and confirmation by the country of the destination port and the shipping line for the specific shipment.
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