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Classification of Hazardous MaterialsTheDOThas broadauthority toregulate hazardousmaterials thatarein transport, includingthediscretion todetermine whichmaterialsshallbe classified as"hazardous". These materials areplacedin oneof ninecategories,
based ontheir chemicaland physicalproperties. Based onthe classification of thematerial, theDOTis alsoresponsiblefor determiningtheappropriate packagingmaterialsfor shippingor transport. Finally, alsobased onthe
materialclassification, strictguidelines are furnishedfor proper labeling/marking of packages of hazardous materialsoffer ed for transport, and for placarding of transport vehicles.
Class 1: Explosives
Division 1.1 Explosives with a mass explosion hazard
Division 1.2 Explosives with a projection hazard
Division 1.3 Explosives with predominantly a fire hazard
Division 1.4 Explosives with no significant blast hazard
Division 1.5 Very insensitive explosives
Division 1.6 Extremely insensitive explosive articles
Class 2: Gases
Division 2.1 Flammable gases
Division 2.2 Nonflammable gases
Division 2.3 Poison gas
Division 2.4 Corrosive gases
Class 3: Flammable liquids.
Division 3.1 Flashpoint below -18oC (0oF)
Division 3.2 Flashpoint -18oC and above, but less than 23 oC (73oF)
Division 3.3 Flashpoint 23oC and up to 61oC (141oF)
Class 4: Flammable solids; spontaneously combustible materials; and materials that are dangerous when wet
Division 4.1 Flammable solids
Division 4.2 Spontaneously combustible materials
Division 4.3 Materials that are dangerous when wet
Class 5: Oxidizers and organic peroxides
Division 5.1 Oxidizers
Division 5.2 Organic peroxides
Class 6: Poisons and etiologic materials
Division 6.1 Poisonous materials
Division 6.2 Etiologic (infectious) materials
Class 7: Radioactive materials
Any material, or combination of materials, that spontaneously gives off ionizing radiation. It has a specific activity greater than 0.002
microcuries per gram.
Class 8: Corrosives
A material, liquid or solid, that causes visible dest ruction or irreversible alteration to human skin or a liquid that has a severe corrosion
rate on steel or aluminum.
Class 9: Miscellaneous
A material which presents a hazard during transport, but which is not included in any other hazard class (such as a hazardous
substance or a hazardous waste).
ORM-D: Other regulated material
A material which, although otherwise subjected to regulations, presents a limited hazard during transportation due to its form, quantit y
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