Manufacture of refractory products

This class includes:

• manufacture of refractory mortars, concretes etc.
• manufacture of refractory ceramic goods:

• heat-insulating ceramic goods of siliceous fossil meals
• refractory bricks, blocks and tiles etc.
• retorts, crucibles, muffles, nozzles, tubes, pipes etc.

This class also includes:

• manufacture of refractory articles containing magnesite, dolomite or chromite