The miscellaneous hazardous materials category encompasses all
hazardous material
Dangerous goods, abbreviated DG, are substances that when transported are a risk to health, safety, property or the environment. Certain dangerous goods that pose risks even when not being transported are known as hazardous materials ( syllabi ...
s that do not fit one of the definitions listed in Class 1 through Class 8.
Divisions

The miscellaneous hazardous material is a material that presents a hazard during transportation but which does not meet the definition of any other
hazard class
Dangerous goods, abbreviated DG, are substances that when transported are a risk to health, safety, property or the environment. Certain dangerous goods that pose risks even when not being transported are known as hazardous materials ( syllabi ...
. This class includes:
#Any material which has an anesthetic, noxious or other similar property which could cause extreme annoyance or discomfort to a
flight crew
Aircrew, also called flight crew, are personnel who operate an aircraft while in flight. The composition of a flight's crew depends on the type of aircraft, plus the flight's duration and purpose.
Commercial aviation
Flight deck positions ...
member so as to prevent the correct performance of assigned duties; or
#Any material that meets the definition in 49 CFR 171.8 for an elevated temperature material, a hazardous substance, a
hazardous waste, or a
marine
Marine is an adjective meaning of or pertaining to the sea or ocean.
Marine or marines may refer to:
Ocean
* Maritime (disambiguation)
* Marine art
* Marine biology
* Marine debris
* Marine habitats
* Marine life
* Marine pollution
Military
* ...
pollutant
A pollutant or novel entity is a substance or energy introduced into the environment that has undesired effects, or adversely affects the usefulness of a resource. These can be both naturally forming (i.e. minerals or extracted compounds like o ...
.
A new sub-class, class 9A, has been in effect since January 1, 2017. This is limited to the labeling of the transport of
lithium batteries
Lithium battery may refer to:
* Lithium metal battery, a non-rechargeable battery with lithium as an anode
** Rechargeable lithium metal battery, a rechargeable counterpart to the lithium metal battery
* Lithium-ion battery, a rechargeable bat ...
.
Placards
Compatibility Table
Packing Groups
The packing group of a Class 9 material is as indicated in Column 5 of the 49CFR 172.101 Table.
References
*49 CFR 173.140
*49 CFR 173.141
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