This group 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 2391;

Manufacture of cements used in dentistry, see 3250;

Manufacture of articles of cement, see 2396;

Manufacture of ready-mix and dry-mix concrete and mortars, see 2396.