| 1/00 | Cleaning or pickling metallic material with solutions or molten salts (with organic solvents C23G 5/02) |
| 1/02 | Cleaning or pickling metallic material with solutions or molten salts (with organic solvents C23G 5/02) with acid solutions |
| 1/04 | Cleaning or pickling metallic material with solutions or molten salts (with organic solvents C23G 5/02) with acid solutions using inhibitors |
| 1/06 | Cleaning or pickling metallic material with solutions or molten salts (with organic solvents C23G 5/02) with acid solutions using inhibitors organic inhibitors |
| 1/08 | Cleaning or pickling metallic material with solutions or molten salts (with organic solvents C23G 5/02) with acid solutions Iron or steel |
| 1/10 | Cleaning or pickling metallic material with solutions or molten salts (with organic solvents C23G 5/02) with acid solutions Other heavy metals |
| 1/12 | Cleaning or pickling metallic material with solutions or molten salts (with organic solvents C23G 5/02) with acid solutions Light metals |
| 1/14 | Cleaning or pickling metallic material with solutions or molten salts (with organic solvents C23G 5/02) with alkaline solutions |
| 1/16 | Cleaning or pickling metallic material with solutions or molten salts (with organic solvents C23G 5/02) with alkaline solutions using inhibitors |
| 1/18 | Cleaning or pickling metallic material with solutions or molten salts (with organic solvents C23G 5/02) with alkaline solutions using inhibitors Organic inhibitors |
| 1/19 | Cleaning or pickling metallic material with solutions or molten salts (with organic solvents C23G 5/02) with alkaline solutions Iron or steel |
| 1/20 | Cleaning or pickling metallic material with solutions or molten salts (with organic solvents C23G 5/02) with alkaline solutions Other heavy metals |
| 1/22 | Cleaning or pickling metallic material with solutions or molten salts (with organic solvents C23G 5/02) with alkaline solutions Light metals |
| 1/24 | Cleaning or pickling metallic material with solutions or molten salts (with organic solvents C23G 5/02) with neutral solutions |
| 1/26 | Cleaning or pickling metallic material with solutions or molten salts (with organic solvents C23G 5/02) with neutral solutions using inhibitors |
| 1/28 | Cleaning or pickling metallic material with solutions or molten salts (with organic solvents C23G 5/02) with molten salts |
| 1/30 | Cleaning or pickling metallic material with solutions or molten salts (with organic solvents C23G 5/02) with molten salts using inhibitors |
| 1/32 | Cleaning or pickling metallic material with solutions or molten salts (with organic solvents C23G 5/02) with molten salts Heavy metals |
| 1/34 | Cleaning or pickling metallic material with solutions or molten salts (with organic solvents C23G 5/02) with molten salts Light metals |
| 1/36 | Cleaning or pickling metallic material with solutions or molten salts (with organic solvents C23G 5/02) Regeneration of waste pickling liquors |