Sometimes the questions I receive challenge me to re-visit older articles and dig deeper into the regulations.  Like this one from November 23 of 2017:

Dear Mr. Stoehr,

I saw the piece you wrote on applicability of  “De Minimis quantities” on your website. Are you suggesting that other classes of Hazardous Material such as Class 2, Division 5.2, Division 6.2,  and packing group I of other authorized HazMat are not allowed to be shipped in De Minimis quantities according to the rules for shipping De Minimis quantities? Looking forward to your reply. Thanks.

Best

I researched the regulations, checked my article, and got back to him the same day:

Thank you for contacting me.  I will try to answer your question below.

• Some HazMat, i.e., Division 6.2 Infectious Substance, is not eligible for the De Minimis Exception.
• A packing group I of any HazMat is not subject to the De Minimis Exception.
• The De Minimis Exception is only available to the following hazard classes and divisions of Packing Group II or III:
  • Class 3 Flammable and Combustible Liquid
  • Division 4.1 Flammable Solid
  • Division 4.2 Spontaneously Combustible
  • Division 4.3 Dangerous When Wet
  • Division 5.1 Oxidizer
  • Division 6.1 Poisonous Material
  • Class 8 Corrosive Material
  • Class 9 Miscellaneous
• Read: The De Minimis Exception from the Hazardous Materials Regulations

I hope this helps.  Please don’t hesitate to contact me with any other questions.