1. What is the IMDG Code?
The International Maritime Dangerous Goods (IMDG) Code is the global regulatory framework for the safe transport of dangerous goods by sea. It was developed by the International Maritime Organization (IMO) and contains detailed requirements for classification, packaging, marking, labeling, documentation, stowage, segregation, and emergency response procedures. The primary objective is to protect people, ships, cargo, and the marine environment from the risks associated with dangerous goods transport.
If your work involves preparing, handling, packing, loading, documenting, or transporting dangerous goods by sea, consider following the IMDG Awareness training available at .
2. Who must comply with the IMDG Code?
The IMDG Code applies to everyone involved in the maritime transport chain of dangerous goods. This includes shippers, consignors, freight forwarders, packers, consolidators, warehouse personnel, logistics coordinators, carriers, terminal operators, and vessel operators. Compliance is not limited to shipping companies alone.
3. Is IMDG training mandatory?
Yes. Personnel involved in the transport of dangerous goods intended for sea transport must receive training appropriate to their responsibilities. Training must include general awareness, function-specific requirements, and safety training.
Learn the requirements through the IMDG Awareness course at .
4. What are the nine IMDG hazard classes?
The IMDG Code divides dangerous goods into nine hazard classes:
Class 1 Explosives
Class 2 Gases
Class 3 Flammable liquids
Class 4 Flammable solids and related substances
Class 5 Oxidizing substances and organic peroxides
Class 6 Toxic and infectious substances
Class 7 Radioactive materials
Class 8 Corrosive substances
Class 9 Miscellaneous dangerous substances and articles
Correct classification is the foundation of compliance.
5. What is a UN Number?
A UN Number is a four-digit identification number assigned to a dangerous substance or article. It allows dangerous goods to be recognized worldwide regardless of language differences. For example, UN 1203 refers to gasoline.
6. What is a Proper Shipping Name?
The Proper Shipping Name (PSN) is the official transport name assigned to a dangerous substance in the Dangerous Goods List. Trade names may not replace the Proper Shipping Name on transport documents.
7. What is a Packing Group?
Packing Groups indicate the degree of danger presented by a substance:
Packing Group I – High danger
Packing Group II – Medium danger
Packing Group III – Low danger
The Packing Group determines packaging performance requirements.
8. What is the Dangerous Goods List?
The Dangerous Goods List is found in Part 3 of the IMDG Code and provides key information such as UN numbers, hazard classes, packing groups, labels, special provisions, stowage requirements, and segregation instructions.
9. What is segregation under the IMDG Code?
Segregation means separating incompatible dangerous goods to prevent dangerous reactions during transport. Certain substances may react violently, release toxic gases, cause fires, or create explosions if stored together.
10. Why is segregation so important?
Improper segregation has contributed to serious maritime incidents involving fires, explosions, and toxic releases. Proper segregation reduces the likelihood of incompatible substances interacting during transport.
11. What are segregation groups?
Segregation groups identify substances with similar chemical properties, such as acids, alkalis, cyanides, chlorates, and ammonium compounds. These groups help determine compatibility requirements.
12. What does “Away From” mean in segregation requirements?
“Away From” is one of the segregation levels in the IMDG Code and requires a minimum separation between incompatible dangerous goods. The exact separation depends on vessel type and cargo arrangement.
13. What is a Marine Pollutant?
A Marine Pollutant is a substance that may present a significant hazard to aquatic life if released into the marine environment. Such products require additional marking and transport provisions.
14. What is the Marine Pollutant mark?
The Marine Pollutant mark identifies packages containing environmentally hazardous substances and helps prevent marine contamination during maritime transport.
15. What are Limited Quantities (LQ)?
Limited Quantities are small amounts of dangerous goods that may be transported under certain simplified provisions when specific quantity limits are met. However, special marking requirements still apply.
16. What are Excepted Quantities?
Excepted Quantities allow extremely small amounts of dangerous goods to be transported under reduced regulatory requirements provided strict conditions are met.
17. What is a Dangerous Goods Declaration (DGD)?
The Dangerous Goods Declaration is a legally required document describing the dangerous goods being shipped. It contains essential information such as the UN Number, Proper Shipping Name, hazard class, packing group, quantity, and special provisions.
18. Who is responsible for the Dangerous Goods Declaration?
The shipper or consignor is responsible for ensuring the declaration is complete, accurate, and compliant with the IMDG Code.
19. What is a Container Packing Certificate?
The Container Packing Certificate confirms that dangerous goods were packed correctly into the container and that all applicable IMDG requirements were followed.
20. Why must dangerous goods be correctly marked?
Marking allows everyone in the transport chain to quickly identify hazardous cargo and apply the correct handling and emergency procedures.
21. Why must dangerous goods be labeled?
Labels communicate the specific hazards associated with a substance and assist emergency responders during incidents.
22. What is the difference between a label and a placard?
Labels are placed on individual packages, while placards are larger hazard signs displayed on freight containers, vehicles, or transport units.
23. What is stowage?
Stowage refers to the location and manner in which dangerous goods are positioned aboard a vessel to ensure safety during transport.
24. Why does the IMDG Code include stowage requirements?
Some dangerous goods must be protected from heat, ignition sources, accommodation spaces, or other dangerous cargoes. Stowage provisions help manage these risks.
25. Can dangerous goods be carried below deck?
Many dangerous goods may be carried below deck, but some substances are restricted to on-deck stowage due to ventilation, emergency access, or fire risks.
26. What is an EmS Guide?
The Emergency Response Procedures for Ships Carrying Dangerous Goods (EmS) provide guidance for responding to fires and spills involving dangerous goods at sea.
27. What is the purpose of the MFAG?
The Medical First Aid Guide (MFAG) provides medical advice for treating persons exposed to dangerous goods during maritime incidents.
28. How often is the IMDG Code updated?
The IMDG Code is amended on a regular two-year cycle to reflect technological developments, lessons learned from incidents, and international harmonization efforts.
29. What happens if dangerous goods are incorrectly classified?
Incorrect classification may lead to inappropriate packaging, labeling, segregation, or emergency response measures, increasing the risk of serious incidents.
30. Can dangerous goods be transported without training?
No. Personnel must receive training appropriate to their responsibilities before performing dangerous goods functions independently.
31. What does function-specific training mean?
Function-specific training focuses on the tasks performed by an employee, such as packing, documentation, classification, loading, or cargo acceptance.
32. What is security awareness training?
Security awareness training helps personnel recognize security risks associated with dangerous goods and understand measures to prevent misuse.
33. Are freight forwarders required to know the IMDG Code?
Yes. Freight forwarders arranging dangerous goods shipments must understand applicable IMDG requirements relevant to their role.
34. Do warehouse employees need IMDG training?
If warehouse personnel handle, store, pack, load, or prepare dangerous goods for maritime transport, they require IMDG training appropriate to their duties.
35. What are Special Provisions?
Special Provisions provide additional requirements, exceptions, or clarifications applicable to specific dangerous goods entries.
36. What are packing instructions?
Packing instructions specify which packaging types may be used for a particular dangerous substance and under what conditions.
37. What is a UN-approved package?
A UN-approved package has been tested and certified to meet performance standards established for dangerous goods transport.
38. Can damaged dangerous goods be transported?
Damaged dangerous goods generally require special consideration and may need salvage packaging or competent authority approval before transport.
39. What is overpacking?
Overpacking occurs when multiple compliant packages are placed into a larger outer package for easier handling and transport. Specific marking requirements apply.
40. What is a freight container under the IMDG Code?
A freight container is a reusable transport unit designed to facilitate efficient multimodal transport while protecting cargo.
41. What is multimodal transport?
Multimodal transport involves dangerous goods moving through multiple transport modes such as road, rail, sea, and air during a single logistics chain.
42. Why must dangerous goods documentation be accurate?
Documentation ensures that carriers, terminals, inspectors, and emergency responders understand the hazards associated with a shipment.
43. What are the consequences of non-compliance with the IMDG Code?
Non-compliance may result in shipment delays, rejected cargo, fines, regulatory enforcement actions, environmental damage, injuries, or criminal liability.
44. What is a flash point and why is it important?
The flash point is the lowest temperature at which a liquid produces enough vapor to ignite. It plays a critical role in classification and transport requirements for flammable liquids.
45. What is self-reactive material?
Self-reactive substances can undergo strong exothermic decomposition even without oxygen, making them particularly hazardous during transport.
46. What is the role of the shipper under the IMDG Code?
The shipper is responsible for correct classification, packaging, marking, labeling, documentation, and compliance with all applicable requirements.
47. How does the IMDG Code protect the marine environment?
The Code includes provisions for Marine Pollutants, packaging integrity, documentation, emergency response, and safe handling practices to reduce pollution risks.
48. Why is refresher training important?
Regulations evolve continuously. Refresher training ensures personnel remain aware of amendments, new requirements, and best practices.
49. What should employees do if they discover a dangerous goods incident?
Employees should follow emergency procedures, protect themselves and others, notify responsible personnel, and use applicable emergency response information such as the EmS Guide.
50. How can I learn the fundamentals of the IMDG Code?
A structured awareness course is one of the most effective ways to understand classification, documentation, packaging, marking, labeling, segregation, stowage, and emergency procedures. The IMDG Awareness course available through provides practical knowledge for personnel involved in dangerous goods transport by sea and helps organizations improve compliance and safety throughout the maritime logistics chain.
