According to the ADR (European Agreement concerning the International Carriage of Dangerous Goods by Road), goods that are classified into 9 main classes are considered dangerous.
Class 1: Explosives: Includes materials designed to produce a sudden and violent physical effect by rapidly changing their state from solid to gas.
Class 2: Gases: Comprises gases that may be flammable, toxic, corrosive or asphyxiating.
Class 3: Flammable liquids: Includes liquids that can easily ignite at normal temperatures.
Class 4: Flammable solids, oxidizing substances and organic peroxides: Includes flammable solids, substances that promote combustion and organic peroxides.
Class 5: Oxidizing agents and organic peroxides: Contains substances that may promote combustion of other materials.
Class 6: Toxic and infectious substances: Toxic substances that can cause harm if swallowed or inhaled, as well as infectious substances.
Class 7: Radioactive materials: Includes materials with radiation levels that require special handling.
Class 8: Corrosive substances: Includes substances that can cause serious damage if inhaled or swallowed.
Class 9: Miscellaneous hazardous materials and articles: This category covers substances that present a risk not covered by the previous classes, such as lithium batteries and other materials with hazardous properties.
