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Generally, an empty packaging containing only the residue of a hazardous material are offered for transportation and transported in the same manner as when it previously contained a greater quantity of that hazardous material. However, there are some conditions in which an empty package previously containing hazmat is considered empty and not subject to the hazardous materials regulations.
An empty packaging is not subject to any other requirements of the hazardous materials regulations (HMR) if:
Non-bulk packaging with residue. A non-bulk packaging containing only the residue of a hazardous material covered by Table 2 of 172.504:
Elevated temperature materials. A package that contains a residue of an elevated temperature material may remain marked as when it contained a greater quantity, even though it no longer meets the definition of an elevated temperature material (173.29(g)). See Elevated Temperature Materials for more information on this topic.
Hazardous substances, hazardous wastes, or marine pollutants. A package that contains a residue of a hazardous substance, that is not a hazardous waste or marine pollutant, may remain marked, labeled, or placarded as when it contained a greater quantity, even though it no longer meets the definition of a hazardous substance (173.29(h)).