The IMDG Code, or International Maritime Dangerous Goods Code, is the globally recognised standard for the safe transportation of dangerous goods by sea. Developed by the International Maritime Organization (IMO), the IMDG Code provides detailed regulations for classifying, packaging, marking, labelling, documenting, handling, stowing, and transporting hazardous materials on ships. Its primary objective is to protect human life, preserve the marine environment, and ensure the safe movement of dangerous goods throughout international maritime trade.

Every year, millions of tonnes of hazardous materials are transported by sea, including chemicals, fuels, gases, industrial products, pharmaceuticals, and consumer goods. Without internationally standardised safety procedures, these materials could present serious risks to crew members, passengers, cargo, IMDG Code vessels, ports, and the environment. The IMDG Code establishes consistent global requirements that help shipping companies, freight forwarders, exporters, importers, and logistics providers manage these risks effectively.

The IMDG Code applies to a wide range of dangerous goods transported by sea. These materials are divided into nine hazard classes, each representing a different type of risk. The classifications include explosives, gases, flammable liquids, flammable solids, oxidising substances, toxic materials, radioactive materials, corrosive substances, and miscellaneous dangerous goods. Each hazardous product receives a specific United Nations (UN) number, proper shipping name, hazard classification, packing group where applicable, and transport requirements.

Correct classification is one of the most important elements of IMDG Code compliance. Before dangerous goods are shipped, they must be accurately identified according to their physical and chemical properties. Proper classification determines how the goods should be packaged, labelled, documented, stored, segregated, and transported. Incorrect classification can increase safety risks, delay shipments, and result in regulatory penalties.

Packaging requirements form another essential part of the IMDG Code. Dangerous goods must be placed in approved packaging that has been tested to withstand normal transport conditions while preventing leaks, spills, or contamination. Packaging standards vary depending on the hazard classification, quantity, and nature of the goods being transported. Approved packaging helps minimise risks during loading, unloading, storage, and ocean transport.

The IMDG Code also establishes detailed marking and labelling requirements. Packages containing dangerous goods must display appropriate hazard labels, UN numbers, proper shipping names, orientation arrows where required, and other mandatory markings. These labels provide immediate visual information about the hazards involved, allowing transport workers and emergency responders to handle cargo safely.

Documentation is another key requirement. Every shipment of dangerous goods must include accurate transport documents that identify the hazardous materials, their classification, packaging details, emergency response information, and any applicable special provisions. Proper documentation ensures that everyone involved in the transportation process has access to essential safety information throughout the journey.

One of the unique features of the IMDG Code is its guidance on cargo segregation and stowage. Certain hazardous substances cannot be stored together because they may react dangerously if mixed during transport. The Code specifies separation distances and storage arrangements that reduce the likelihood of chemical reactions, fires, explosions, or contamination aboard ships.