| 23.1 | MANUFACTURE OF GLASS AND GLASS PRODUCTS |
| Class | The name of the class |
| 23.11 | Manufacture of flat glass |
| 23.12 | Shaping and processing of flat glass |
| 23.13 | Manufacture of hollow glass |
| 23.14 | Manufacture of glass fibres |
| 23.19 | Manufacture and processing of other glass, including technical glassware |
| 23.2 | MANUFACTURE OF REFRACTORY PRODUCTS |
| Class | The name of the class |
| 23.20 | Manufacture of refractory products |
| 23.3 | MANUFACTURE OF CLAY BUILDING MATERIALS |
| Class | The name of the class |
| 23.31 | Manufacture of ceramic tiles and flags |
| 23.32 | Manufacture of bricks, tiles and construction products, in baked clay |
| 23.4 | MANUFACTURE OF OTHER PORCELAIN AND CERAMIC PRODUCTS |
| Class | The name of the class |
| 23.41 | Manufacture of ceramic household and ornamental articles |
| 23.42 | Manufacture of ceramic sanitary fixtures |
| 23.43 | Manufacture of ceramic insulators and insulating fittings |
| 23.44 | Manufacture of other technical ceramic products |
| 23.49 | Manufacture of other ceramic products |
| 23.5 | MANUFACTURE OF CEMENT, LIME AND PLASTER |
| Class | The name of the class |
| 23.51 | Manufacture of cement |
| 23.52 | Manufacture of lime and plaster |
| 23.6 | MANUFACTURE OF ARTICLES OF CONCRETE, CEMENT AND PLASTER |
| Class | The name of the class |
| 23.61 | Manufacture of concrete products for construction purposes |
| 23.62 | Manufacture of plaster products for construction purposes |
| 23.63 | Manufacture of ready-mixed concrete |
| 23.64 | Manufacture of mortars |
| 23.65 | Manufacture of fibre cement |
| 23.69 | Manufacture of other articles of concrete, plaster and cement |
| 23.7 | CUTTING, SHAPING AND FINISHING OF STONE |
| Class | The name of the class |
| 23.70 | Cutting, shaping and finishing of stone |
| 23.9 | MANUFACTURE OF ABRASIVE PRODUCTS AND NON-METALLIC MINERAL PRODUCTS N.E.C. |
| Class | The name of the class |
| 23.91 | Production of abrasive products |
| 23.99 | Manufacture of other non-metallic mineral products n.e.c. |