[DOT 49 CFR 172.505] Subsidiary placards for hazardous materials

Both bulk and non-bulk shipments of hazardous materials must be placarded under certain circumstances. Any quantity of hazardous material listed on placard table 1 in 172.504 must be placarded and, if you ship at least 1001 pounds (aggregate weight, non-bulk) of materials in placard table 2, the vehicle must be placarded. There are important exceptions in 49 CFR 172.500.

DOT’s requirements for subsidiary placards are significantly different from subsidiary labeling requirements. Subsidiary placards corresponding to the subsidiary hazards of materials are always allowed to be displayed on transport vehicles, portable tanks, or freight containers, however according to 49 CFR 172.505 they are only required if:

  • All materials with a poison inhalation subsidiary hazard must be placarded with either POISON INHALATION HAZARD or POISON GAS placards.
  • In addition to the RADIOACTIVE placard, if there is 1,001 lb or more gross weight of fissile or low specific activity Uranium Hexafluoride the outer vehicle or unit must be placarded with a CORROSIVE placard on each side and each end.
  • All materials having a subsidiary dangerous when wet hazard must display the DANGEROUS WHEN WET placard on each side and each end.