Dangerous goods are divided into nine categories according to their different dangers, and some are divided into several items.

Class I explosives; The second kind of compressed gas and toxic gas; The third kind of flammable liquid; Category IV Flammable solids and substances that spontaneously ignite in contact with water; The fifth kind of organic matter and organic peroxide; The sixth poison; Class VII radioactive substances; Class VIII corrosive products; Category 9 Other Dangerous Goods and Materials.