Manufacture of cement, lime and plaster

This class includes: - manufacture of clinkers and hydraulic cements, including Portland, aluminous cement, slag cement and superphosphate cements

This class excludes: - manufacture of refractory mortars, concrete etc., see 23.20 - manufacture of ready-mixed and dry-mix concrete and mortars, see 23.63, 23.64 - manufacture of articles of cement, see 23.69 - manufacture of cements used in dentistry, see 32.50