Manufacture of lime and plaster

This class includes:

• manufacture of quicklime, slaked lime and hydraulic lime
• manufacture of plasters of calcined gypsum or calcium sulphate

This class also includes:

• manufacture of calcined or sintered dolomite

This class excludes:

• manufacture of pure calcium oxide and calcium hydroxide, see 20.12
• manufacture of articles of plaster, see 23.62, 23.66