IMDG Code, Marking of Packages

Chapter 5.2 of the International Maritime Dangerous Goods (IMDG) Code, "Marking and Labeling of Packages Including IBCs," provides information on the marking and labeling of dangerous goods. The first Section, 5.2.1, addresses markings for dangerous goods packages. Each package containing a dangerous good will display the proper shipping name and the corresponding UN number (for example, HYPOCHLORITE SOLUTION UN 1791). All package markings must be visible and readable, in a color that contrasts with the package. Package markings must remain identifiable on packages surviving at least three months immersion in the sea.

Certain containers, including salvage packagings and pressure receptacles, and containers that carry damaged, spilled, leaking, or non-conforming dangerous goods packages, must also be marked with the word "SALVAGE." IBCs with a capacity greater than 450 liters and large packagings must be marked on two opposing sides. Special marking provisions are provided for radioactive material (under 5.2.1.5 of the IMDG Code) and marine pollutants (5.2.1.6 of the IMDG Code). Legible marking of package orientation is required for the following types of packages:

• Combination packagings with inner packagings containing liquid dangerous goods
• Single packagings fitted with vents
• Cryogenic receptacles intended for the transport of refrigerated liquefied gas

Any arrows that may be on the outer packaging of these items for some other purpose must not be displayed.

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