| 1/00 | Pretreatment of collagen-containing raw materials for the manufacture of glue |
| 1/02 | Pretreatment of collagen-containing raw materials for the manufacture of glue of bones (defatting bones C11B) |
| 1/04 | Pretreatment of collagen-containing raw materials for the manufacture of glue of hides, hoofs, or leather scrap (recovery of tanning agents C14C) |
| 3/00 | Isolation of glue or gelatine from raw materials, e.g. by extracting, by heating (gelatine for foodstuffs A23J 1/1) |
| 3/02 | Isolation of glue or gelatine from raw materials, e.g. by extracting, by heating (gelatine for foodstuffs A23J 1/1) Purification of solutions of gelatine |
| 5/00 | Stabilisation of solutions of glue or gelatine |
| 7/00 | Preparation of water-insoluble gelatine |
| 9/00 | Drying of glue or gelatine |
| 9/02 | Drying of glue or gelatine in the form of foils |
| 9/04 | Drying of glue or gelatine in the form of granules, e.g. beads |