How to Identify a UN-Certified Cardboard Box for Dangerous Goods | ADR, IMDG, IATA

Why is certified packaging essential for the transport of dangerous goods?
Primary or outer packaging reduces the risk of accidents during transport. UN-certified cardboard boxes are among the most commonly used types of packaging, but not all cardboard is suitable. Correctly identifying certified packaging is crucial to ensure compliance with ADR, IMDG, IATA, and RID regulations.

How can you recognize a UN-certified cardboard box?
The first step is to check the UN marking. All certified cardboard boxes carry a code in accordance with the regulations (ADR 6.1.3, IMDG 6.1.3, IATA 6.0.3).
An example of a UN marking is:
4G/X25/S/24/I/AB1234

4G = Type of packaging (cardboard box)

X/Y/Z = Packing groups the prototype passed in testing

25 = Maximum gross weight allowed (kg)

S = Packaging for solids or combination packaging

24 = Year of manufacture

I = State authorizing the marking

AB1234 = Manufacturer or certification body code

Note: The presence of a marking alone does not guarantee compliance if the box is used outside the certified context.

What documents accompany a certified cardboard box?
Every certified cardboard box comes with a certification report (test report) issued by a notified body.
The certificate includes:

UN test code

Maximum gross weight allowed

Description of the packaging

Type of internal container tested

Test results (drop, compression, leakproofness, stacking, etc.)

A box is considered certified only when used together with the tested internal containers.

When is a certified cardboard box no longer valid?
A box loses its certification validity if:

It is deformed or wet

It has been cut or structurally modified

The UN marking is no longer visible or legible

Even if technically compliant, a damaged box invalidates the certification.

Where can you buy reliable UN-certified cardboard boxes?
It is recommended to contact specialized manufacturers or suppliers who can:

Provide full certification documentation

Recommend the correct combination of cardboard box + internal container

Ensure traceability of production

What are the risks of using a non-compliant box?
Packaging errors can lead to:

ADR non-compliance

Cargo rejection

Fines or customs holds

Legal liability in case of an incident

For this reason, a cardboard box should be considered a safety device, not just a container.

""