Classe · NACE Rev. 2.1 / TEÁOR'25
23.20 Fabricação de produtos cerâmicos refratários
Manufacture of refractory products
As notas explicativas oficiais são apresentadas em inglês.
Esta classe compreende
- manufacture of intermediate products from mined or quarried non-metallic minerals (e.g. gravel, stone or clay)
- manufacture of refractory mortars, concretes, etc.
- manufacture of refractory ceramic goods, e.g.:
- heat-insulating ceramic goods of siliceous fossil meals
- refractory bricks, blocks and tiles, etc.
- retorts, crucibles, muffles, nozzles, tubes, pipes, etc.
Esta classe compreende também
- manufacture of refractory articles containing magnesium oxide, calcium magnesium oxide or chromite