Dangerous goods packaging requirements: what you need to get right

When shipping dangerous goods, packaging is one of the most critical factors in whether a shipment moves smoothly or gets rejected. Carriers, customs authorities and regulators all check if packaging meets the required standards.

If it does not, shipments are likely to be rejected, delayed or flagged for inspection. Getting packaging right from the start is essential for smooth and predictable international shipping.

What are dangerous goods packaging requirements?

Dangerous goods packaging requirements define how hazardous materials must be packed and prepared for safe transport. These rules are set by international regulations such as ADR (road), IMDG (sea) and IATA (air).

In practice, this means packaging must:

• safely contain the substance under normal transport conditions
• withstand impact, pressure and environmental changes
• prevent leaks or contamination
• remain stable throughout handling and transit

The exact requirements depend on the type of goods, the hazard class and the chosen transport mode.

Types of dangerous goods packaging

Dangerous goods packaging is typically built in layers, with each layer serving a specific purpose.

Inner packaging

This is the direct container of the substance, such as bottles, cans or bags. It must be compatible with the material inside and prevent leaks, especially for liquids, chemicals or corrosive materials.

Outer packaging

The outer layer protects against external impact during handling and transport. This is usually a box, drum or crate.

Combination packaging

Many shipments use a combination of inner and outer packaging, often with cushioning materials to absorb shocks during transport.

Choosing the right structure depends on the product, the hazard class and the transport mode.

UN packaging certification

A key requirement in dangerous goods packaging is the use of UN-certified packaging. This packaging has been tested under controlled conditions to ensure it can handle real-world transport scenarios such as drops, stacking and vibration.

Only packaging that meets these standards can be used for many hazardous shipments.

UN-certified packaging is marked with a specific code printed on the package.

This code indicates:

• the type of packaging
• the material used
• the performance level
• the maximum weight or pressure it can handle

Using packaging without valid certification is a common reason for shipment refusal.

Segregation rules: keeping dangerous goods apart

Packaging is not only about protecting the product itself, but also about preventing dangerous interactions.

Segregation rules define which substances must be kept separate during packing and transport. Certain combinations can lead to chemical reactions, fire or other hazards.

For example:

• flammable materials must be separated from oxidising substances
• toxic goods should not be packed with food or consumer products
• certain chemicals must not come into contact under any circumstances

These rules apply both within a single package and across shipments in the same vehicle or container.

Packaging requirements per transport mode

Although the core principles are similar, packaging requirements differ depending on the transport mode.

Road transport under ADR generally allows more flexibility but still requires tested and approved packaging.

Sea freight under IMDG requires packaging that can withstand longer transit times and exposure to humidity.

Air freight under IATA has the strictest requirements, especially regarding pressure changes, packaging integrity and quantity limits.

Rail transport under RID closely follows ADR standards.

For international shipping, it is important to check the specific requirements, especially when combining transport modes.

Common dangerous goods packaging mistakes

Even experienced shippers run into issues with dangerous goods packaging. Common mistakes include using non-certified materials, incorrect sealing or packaging that does not match the hazard class.

Another frequent issue is inconsistency between packaging, labelling and documentation, which can lead to additional checks.

Packaging as part of a larger compliance process

Dangerous goods packaging is closely connected to other parts of the shipping process. It needs to align with correct classification, proper labelling and accurate documentation to ensure shipments are handled as expected throughout the transport chain.

For companies shipping internationally, this requires clear processes and coordination across systems, carriers and fulfilment operations. This is especially relevant when shipping at scale or across multiple transport modes.