| Nace | Description | Number of Company |
|---|---|---|
| 23.20.16 | Manufacture of refractory ceramic construction products such as heat-insulating ceramic products and flameproof briquettes, blocks, bricks, refractory bricks, etc. from diatomaceous filtrated earth (diatomaceous earth) | 75 |
| 23.20.17 | Manufacture of ceramic products such as refractory stills, distillation vessels, melting pots, valve tips, tubes, pipes, casting ladles, muffle furnaces, injection tubes, etc. | 29 |
| 23.20.19 | Manufacture of refractory brick | 8 |
| 23.20.20 | Manufacture of refractory cement, mortar and concrete. | 8 |
| 23.31.01 | Manufacture of ceramic tiles and paving stones (including mosaic stones and mosaic cubes) (except refractory ones) | 52 |
| 23.32.02 | Manufacturing of roofing tiles, chimney-pots, chimney-cowls, fireplace and chimney-flue, conduit, fittings, construction products such as tiles, of non-refractory clay and earth (incl.ceramic conduit,pipe and fittings)(excl.bricks, tiles) | 92 |
| 23.32.03 | Manufacturing of non-refractory brick and tile in baked clay | 12 |
| 23.42.01 | Manufacture of ceramic sanitary products | 95 |
| 23.43.01 | Manufacture of ceramic insulators and insulating fittings | 19 |
| 23.44.01 | Manufacture of other technical ceramic products (products used at laboratory, chemical and other technical fields) (except refractory ceramic products) | 15 |
