This class includes:
——manufacture of clinkers and hydraulic cements, including Portland, aluminous cement, slag cement and superphosphate cements
——manufacture of quicklime, slaked lime and hydraulic lime
——manufacture of plasters of calcined gypsum or calcined sulphate
——manufacture of calcined dolomite

This class excludes:
——manufacture of refractory mortars, concrete etc., see 2391
——manufacture of articles of cement, see 2395
——manufacture of articles of plaster, see 2395
——manufacture of ready-mixed and dry-mix concrete and mortars, see 2395
——manufacture of cements used in dentistry, see 3250