What is the key regulatory requirement for labeling hazardous cargo according to the IMDG Code?

The key regulatory requirement for labeling hazardous cargo according to the IMDG Code (International Maritime Dangerous Goods Code) is that each package or container of hazardous cargo must be clearly and durably marked with the correct Proper Shipping Name (PSN), UN number, and hazard labels indicating the primary and subsidiary hazards associated with the material. The Proper Shipping Name is the standardized name for the hazardous substance as listed in the IMDG Code. The UN number is a four-digit number that identifies the substance or article. Hazard labels are diamond-shaped symbols that visually communicate the type of hazard (e.g., flammable, corrosive, toxic). These labels must be of the correct size, color, and design as specified in the IMDG Code, and they must be securely affixed to the package or container so that they remain legible throughout transportation. Additionally, the labels must be resistant to the effects of seawater and weather. For example, a drum containing flammable liquid (UN 1203, Gasoline) must be labeled with "Gasoline," "UN 1203," and the flammable liquid hazard label. This labeling requirement ensures that personnel handling the cargo are aware of the hazards involved and can take appropriate precautions.