| 1/00 | Treatment of vegetable material |
| 1/02 | Treatment of vegetable material by chemical methods to obtain bast fibres |
| 1/04 | Treatment of vegetable material Bacteriological retting |
| 3/00 | Treatment of animal material, e.g. chemical scouring of wool (recovery of lanolin or wool wax C11B 11/00) |
| 3/02 | Treatment of animal material, e.g. chemical scouring of wool (recovery of lanolin or wool wax C11B 11/00) De-gumming silk |
| 5/00 | Carbonising rags to recover animal fibres (chemical removal of vegetable impurities from threads or fabrics of animal fibres D06M) |