PKD 23.20.Z—Production of refractory products

Where 23.20.Z sits

1. C Industrial Processing
2. 23 Production of products from other non-metallic mineral raw materials
3. 23.2 Production of refractory products
4. 23.20 Production of refractory products
5. 23.20.Z Production of refractory products

What 23.20.Z includes

• This subclass includes the manufacture of intermediate products from non-metallic raw materials (e.g., gravel, stone, or clay).
• Manufacture of refractory mortars, concretes, and the like,
• Manufacture of refractory ceramic products, for example: • thermal insulation elements made of silica fossil flour, • refractory bricks, blocks, and slabs, • retorts, crucibles, muffles, nozzles, pipes, conduits, and the like,
• Manufacture of refractory products containing magnesium oxide, calcium magnesium oxide, or chromite.

23.20.Z in other systems