Dangerous Goods by Ocean – IMDG Code Requirements

Dangerous goods transported by sea are regulated under the International Maritime Organization International Maritime Dangerous Goods (IMDG) Code.

Although ocean transport allows larger quantities than air freight, compliance remains mandatory and violations may result in vessel refusal, port penalties, or cargo removal.

Ocean DG compliance requires:

  • Proper UN classification

  • Marine pollutant identification (if applicable)

  • IMDG packing group assignment

  • UN-approved packaging

  • Container packing certificate

  • Correct segregation within containers

  • Placarding of freight containers

Freight forwarders must also consider vessel stowage categories and segregation tables when consolidating shipments.

FAQ – Dangerous Goods by Ocean

Are lithium batteries restricted at sea?
Lithium batteries are permitted under IMDG regulations but must comply with classification, packaging, and marking requirements.

What is a Marine Pollutant designation?
Certain substances harmful to the aquatic environment require a Marine Pollutant mark in addition to hazard labels.

Is a Shipper’s Declaration required for ocean DG?
Yes. A Dangerous Goods Declaration must accompany regulated shipments.

What is a Container Packing Certificate?
It certifies that the container was packed in accordance with IMDG requirements, including segregation and load securing.

Ocean DG Regulatory Disclaimer

The IMDG Code is updated biennially and may be supplemented by flag state or port authority requirements. This page provides general information only. Users must consult the most current IMDG Code and verify carrier and port-specific regulations before arranging dangerous goods shipments.

FREIGHT DIRECTORY assumes no responsibility for regulatory violations or operational decisions based on this content.