Chemicals must be stored according to their storage class. Each chemical is allocated one storage class only; those with more than one hazard characteristic are allocated according to the ranking of their hazard characteristics. This ensures that in the case of chemicals with similar or identical hazard characteristics, the same safety measures can be taken, especially against fire and explosion. Liquids or solid substances as well as preparations and products that do not fulfill the criteria of classes 1-8 are characterized as being of classes 10-13. No further differentiation in class is made between classes 10, 11, 12 and 13 as these are all substance-orientated.
| LGK | Designation |
| 1 | Explosion material |
| 2A | Compressed, liquefied, or pressure-dissolved gases |
| 2B | Pressurized gas packages (aerosol containers) |
| 3A | Flammable liquid materials (Flashpoint < 55 °C) |
| 3B | Flammable liquids |
| 4.1A | Flammable solid materials |
| 4.1B | Flammable solid materials |
| 4.2 | Spontaneously combustible materials |
| 4.3 | Materials that form flammable gases in contact with water |
| 5.1A | Oxidizing agents |
| 5.1B | Organic pesticides |
| 6.1A | Flammable toxic materials |
| 6.1B | Non-flammable toxic materials |
| 6.2 | Infectious materials |
| 7 | Radioactive materials |
| 8A | Flammable corrosive materials |
| 8B | Non-flammable corrosive materials |
| 10 | Flammable liquids if not LGK 3A or 3B |
| 11 | Flammable solids |
| 12 | Non-flammable liquids in non-flammable packages |
| 13 | Non-flammable solids in non-flammable packages |
