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Bulk markings
  • Identification numbers are mandatory for all bulk packagings of hazardous materials, though there are specific exceptions.

Unless specifically excepted, all bulk packagings of hazardous materials must be marked with the identification number(s) of the contents. These numbers, unless otherwise provided, must be marked:

  • On each end and each side of a packaging having a capacity of 1,000 gallons (3,785 L) or more,
  • On two opposite sides of a packaging with a capacity of less than 1,000 gallons (3,785 L), or
  • On each end and each side of a tube-trailer motor vehicle.

Identification number display

  • Requirements for display of hazardous materials identification numbers must be observed.
  • Special permit bulk packaging is subject to certain criteria.

There are three ways in which identification numbers may be displayed:

If the identification number markings on a portable tank or cargo tank are not visible, the transport vehicle or freight container used to transport the tank must also be marked with the numbers on each side and each end.

When a tank is permanently installed within an enclosed cargo body of a transport vehicle or freight container, the identification number marking need only be displayed on the sides and ends of the tank that are visible when the enclosed cargo body is opened or entered.

Identification numbers are not required on the ends of portable tanks and cargo tanks having more than one compartment if hazardous materials having different identification numbers are transported in the compartments. The identification numbers on the sides of the tank must be displayed in the same sequence as the compartments containing the materials they identify.

Special permit packaging

When a bulk packaging is labeled instead of placarded, the identification number markings may be displayed on the bulk packaging in the same manner as would be required for a non-bulk packaging.

DOT-SP (followed by the special permit number) is required to be marked on the packaging if it is authorized for use under a special permit.