Dangerous Goods Declaration and Container Packing Certificate: IMDG Documentation Explained
Correct documentation is one of the most important elements of transporting dangerous goods by sea. A shipment may be correctly classified, packed, marked and labelled, but if the accompanying dangerous goods information is incomplete or incorrect, the consignment can still be rejected, delayed or handled incorrectly. Two documents are particularly important in containerised maritime dangerous goods transport: the Dangerous Goods Declaration and the Container/Vehicle Packing Certificate.
In practice, these declarations are often incorporated into the same multimodal dangerous goods document, which can make it appear that they are simply two parts of the same administrative requirement. Their purpose and responsibility are different, however. The Dangerous Goods Declaration relates primarily to the dangerous goods being offered for transport, while the Container/Vehicle Packing Certificate confirms that the cargo transport unit has been packed correctly.
Understanding that distinction is essential for consignors, freight forwarders, packers and other personnel involved in preparing dangerous goods shipments under the IMDG Code.
What is a Dangerous Goods Declaration?
The term Dangerous Goods Declaration, often abbreviated as DGD, is commonly used in the maritime industry for the transport document containing the dangerous goods information required by the IMDG Code.
The purpose of this information is straightforward. Everyone who subsequently handles the shipment must know what dangerous goods are being transported and the hazards associated with them. This includes carriers, terminals, vessel operators and emergency responders.
The dangerous goods description must therefore be based on the actual classification of the substance or article. It is not sufficient to use an internal product name, commercial description or abbreviation that does not properly identify the dangerous goods.
A basic dangerous goods description normally starts with the UN number followed by the Proper Shipping Name, hazard class or division and, where assigned, the packing group. Depending on the substance, article and circumstances, additional information may also be required.
This can include a subsidiary hazard, technical name, marine pollutant information, flashpoint information, control and emergency temperatures for certain substances, waste information or other details required by the applicable IMDG provisions.
The document must consequently be prepared from reliable classification information. Copying the description from an old shipment without checking whether it still applies can create significant compliance problems.
The consignor’s declaration is more than a signature
The Dangerous Goods Declaration is not simply a list of UN numbers and quantities. An important part of the documentation process is the certification by the consignor.
Under the IMDG Code, the dangerous goods transport document must include a certification or declaration confirming that the consignment is accurately described and that the goods have been classified, packaged, marked and labelled or placarded as applicable and are in proper condition for transport according to the relevant regulations.
This gives the declaration considerable significance.
The person signing is not merely confirming that a form has been completed. The declaration connects the documentation with the physical condition and regulatory compliance of the consignment being offered for transport.
Companies should therefore carefully control who is authorised to prepare and sign dangerous goods documentation. Personnel performing this function need sufficient knowledge to understand the information they are certifying.
An employee should never be expected to sign a dangerous goods declaration solely because a signature is required before a shipment can leave the warehouse.
What is the Container/Vehicle Packing Certificate?
The Container/Vehicle Packing Certificate has a different purpose.
When dangerous goods are packed or loaded into a container or vehicle, the people responsible for packing or loading the unit must certify that the operation has been performed in accordance with the applicable provisions.
The certificate is therefore concerned with what happened during the physical packing of the cargo transport unit.
Among other matters, the responsible person is confirming that the container or vehicle was clean, dry and apparently suitable to receive the goods. Packages that require segregation must not have been packed together contrary to the applicable segregation requirements, unless specifically permitted.
The packages must also have been inspected for visible external damage or leakage, and only sound packages should be loaded. Drums should generally be stowed upright unless otherwise authorised, and the cargo must be properly loaded and secured for the intended journey.
These requirements demonstrate why the Container Packing Certificate should never be treated as a routine signature added after a container has already been sealed.
The person providing the certificate needs knowledge of how the container was actually packed.
Dangerous Goods Declaration versus Container Packing Certificate
The easiest way to understand the difference is to consider the question each declaration answers.
The Dangerous Goods Declaration essentially answers: What dangerous goods are being offered for transport, and have they been prepared correctly for transport?
The Container/Vehicle Packing Certificate answers: Was the cargo transport unit itself packed correctly?
Those questions overlap, but they are not identical.
A consignor could provide completely accurate dangerous goods information while a container is subsequently packed incorrectly. For example, two dangerous goods that should be segregated might be placed together inside the same container, or packages could be inadequately secured.
The reverse is also possible. A container could be physically packed and secured correctly while the dangerous goods description on the transport document contains an incorrect Proper Shipping Name or packing group.
Both parts of the compliance process must therefore be correct.
Can both declarations be on the same document?
Yes. This is common practice in international maritime transport.
The IMDG Code permits the dangerous goods transport information and the Container/Vehicle Packing Certificate to be incorporated into a single document. Where they are not combined, the relevant documents must accompany each other.
When the information is combined, the document includes the appropriate declaration concerning the packing of the goods into the container or vehicle, together with the required identification of the person making that declaration.
The Multimodal Dangerous Goods Form is designed to facilitate this process and is widely recognised throughout international logistics.
Combining the declarations is administratively convenient, but it does not combine the underlying responsibilities.
If one person is responsible for preparing the dangerous goods consignment and another organisation physically packs the container, each party remains responsible for its own activities. A combined form should never obscure who actually performed and certified each function.
Common documentation mistakes
Many dangerous goods documentation problems are relatively simple, but they can still lead to shipment delays or rejection.
One frequent error is using a commercial product description instead of the correct Proper Shipping Name. Another is placing the elements of the dangerous goods description in the wrong order or omitting information that is required for a particular substance.
Incorrect packing groups, missing technical names and errors involving marine pollutant information are also possible.
Container Packing Certificates create a different type of risk. A dangerous practice is signing the certificate without having sufficient knowledge of the packing operation. If a third-party warehouse or container packing station performs the loading, responsibilities and information exchange should be clearly defined.
Another common problem is assuming that documentation can correct a physical non-compliance. It cannot.
A perfectly completed Dangerous Goods Declaration does not make incorrectly packed dangerous goods compliant. Similarly, a correctly signed Container Packing Certificate cannot compensate for incorrect classification, packaging, marking or labelling.
The documentation should accurately represent a compliant physical shipment.
Electronic dangerous goods documentation
Modern shipping processes increasingly use electronic data exchange rather than traditional paper documents.
The IMDG Code accommodates electronic data processing and electronic data interchange techniques. Where dangerous goods information is transmitted electronically, provisions exist concerning electronic signatures or the identification of the person authorised to sign.
This is particularly important for modern freight forwarding and shipping environments in which booking information can move electronically between the shipper, freight forwarder, terminal and carrier.
Digitalisation can reduce manual data entry, but it does not transfer responsibility away from the person or company providing the information.
Incorrect dangerous goods data transmitted electronically remains incorrect dangerous goods data.
Companies implementing digital dangerous goods documentation should therefore pay close attention to data quality, authorisation and version control. Product databases should contain verified classification information, and employees should understand which fields originate automatically from master data and which require a shipment-specific assessment.
Why training is essential
Preparing and checking dangerous goods documentation is a regulated function that requires appropriate knowledge.
A consignor needs to understand how dangerous goods are classified and described, which additional information may be required and what is being certified when the declaration is signed. A packer needs different knowledge, including the requirements for preparing packages and loading cargo transport units.
This is why IMDG training should correspond with the employee’s actual responsibilities rather than simply providing the same general course to everyone.
A company should first identify who classifies dangerous goods, who prepares shipping documentation, who signs declarations, who packs packages and who loads containers. Appropriate function-specific training can then be assigned.
Documentation errors are often the final visible symptom of a problem that started earlier in the process. Proper training helps employees recognise those problems before the shipment reaches the port.
Train your consignors in IMDG documentation
Personnel preparing or arranging dangerous goods shipments need more than a general understanding of hazard labels and UN numbers. They must understand the documentation process and their responsibilities within it.
The E-learning IMDG Code Consignor Course (English) from IMDG-course.com is intended for consignors, freight forwarders and other personnel involved in preparing dangerous goods shipments for sea transport. The course includes documentation and limited quantities alongside the wider IMDG requirements relevant to the consignor function.
Improve the quality of your dangerous goods documentation and train the personnel responsible for preparing maritime dangerous goods shipments.
For employees physically packing dangerous goods or loading cargo transport units, the function-specific IMDG Code Packer Course is the more appropriate training option.
Good documentation starts before the form is completed
The Dangerous Goods Declaration and Container Packing Certificate are sometimes regarded as paperwork required at the end of the shipping process. In reality, both documents represent the outcome of decisions and activities that started much earlier.
The dangerous goods must first be correctly classified. Suitable packaging must be selected, packages must be marked and labelled correctly and all applicable transport conditions must be established. When the packages are placed into a container, segregation, inspection, securing and other packing requirements must be followed.
Only then can the declarations accurately represent the shipment.
The Dangerous Goods Declaration and Container Packing Certificate therefore form an important link between the physical shipment and the information used by carriers, terminals and vessels. When both are prepared by competent and properly trained personnel, they provide much more than administrative compliance: they help ensure that everyone handling the cargo knows what is being transported and can rely on the information provided.
