Placarding Subsidiary Hazards

Some hazardous materials have listed both a primary hazard and a subsidiary hazard in column 6 of the HMT. Under certain circumstances, both a primary and a subsidiary hazard placard must be affixed for hazardous materials being shipped in transport vehicles, freight containers, portable tanks, unit load devices, or rail cars. The following subsidiary hazards require placards:

Poison inhalation
Uranium hexafluoride
Dangerous when wet

Hazardous materials that possess subsidiary hazards may display subsidiary placards even if not required to be displayed.

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