Hazmat Marking and Labeling Requirements for International Shipments

Hazmat Marking and Labeling for IATA and IMDG Compliance

Proper marking and labeling of dangerous goods packages is a fundamental requirement under both IATA and IMDG regulations. These visual identifiers communicate hazard information to handlers, emergency responders, and transport crews. South Florida businesses shipping hazardous materials must apply correct marks and labels to every package.

Diamond Hazard Labels

The internationally recognized diamond-shaped hazard labels indicate the primary and any subsidiary hazards of the contents. Each hazard class has a specific color and symbol—red diamonds for flammables, yellow for oxidizers, white for toxic substances, and so on. Labels must be at least 100mm x 100mm for packages and 250mm x 250mm for freight containers.

Proper Shipping Name and UN Number

Every dangerous goods package must display the proper shipping name and UN number as specified in the IATA DGR or IMDG Code. The UN number must be preceded by the letters “UN” and must be durable and legible. This marking enables rapid identification of contents in emergencies.

Orientation Arrows

Packages containing liquid dangerous goods must display orientation arrows (two arrows pointing upward) on two opposite sides. These arrows indicate the correct upright position and must be placed so they point correctly when the package is in its intended orientation.

Overpack Marking

When multiple dangerous goods packages are consolidated in an overpack, the overpack must be marked with the word “OVERPACK” and must display all marks and labels visible on the inner packages—unless those marks are already visible through the overpack.

IMDG-Specific Placarding

Freight containers and vehicles carrying dangerous goods by sea must display enlarged diamond placards matching the hazard class of contents. Marine pollutant marks and elevated temperature marks have additional requirements for ocean container shipments.

Common Marking Errors

Faded labels, incorrect label placement, missing subsidiary hazard labels, and outdated proper shipping names are frequent violations. A freight forwarder with hazmat expertise inspects every package before tender to carriers, catching errors before they result in rejections or fines.