Bulk Markings

You must mark a bulk packaging containing hazardous material with that material's identification number. Each bulk packaging marked with a proper shipping name, common name, or identification number must remain marked when it is emptied unless it is sufficiently cleaned of residue and purged of vapors to remove any potential hazard. If you use a bulk packaging under the terms of a special permit, plainly and durably mark "DOT-SP" on it, followed by the special permit number assigned.

ID number markings are required on each side and each end for any bulk packaging with a capacity of 3,785 L (1,000 gallons) or more, and for cylinders permanently installed on a motor vehicle trailer. If the capacity is less than 3,785 L, then the ID number marking is only required on two opposite sides.

All bulk packaging markings must conform to the following specifications:

• Width of at least 4.0 mm and height of at least 25 mm for portable tanks with capacities less than 3,785 L and IBCs
• Width of at least 6.0 mm and height of at least 50 mm for cargo tanks
• Width of at least 6.0 mm and height of at least 100 mm for rail cars

To learn more about DOT HAZMAT Awareness visit our DOT HAZMAT General Awareness Online Training web page.