Dangerous goods shall be divided into the following classes:

Class 1—Explosives.

Class 2—Gases: compressed, liquefied or dissolved under pressure.

Class 3—Inflammable liquids.

Class 4.1—Inflammable solids.

Class 4.2—Inflammable solids, or substances, liable to spontaneous combustion.

Class 4.3—Inflammable solids, or substances, which in contact with water emit inflammable gases.

Class 5.1—Oxidizing substances.

Class 5.2—Organic peroxides.

Class 6.1—Poisonous (toxic) substances.

Class 6.2—Infectious substances.

Class 7—Radioactive substances.

Class 8—Corrosives.

Class 9—Miscellaneous dangerous substances, that is any other substance which experience has shown, or may show, to be of such a dangerous character that the provisions of this Chapter should apply to it.