This Sub-class includes the manufacture of •clinkers and hydraulic cements, including Portland, aluminous cement, slag cement and/or superphosphate cements •quicklime, slaked lime and/or hydraulic lime •plasters of calcined gypsum or calcined sulphate •calcined dolomite
•manufacture of refractory mortars, concrete, etc., see 2391 •manufacture of articles of cement, see 23959 •manufacture of articles of plaster, see 23959 •manufacture of ready-mixed and dry-mix concrete and mortars, see 23951 •manufacture of cements used in dentistry, see 32503