Manufacturing ceramic products including roofing tiles, bricks, refractory bricks, tiles, stoneware or porcelain, by firing in kilns with a production capacity exceeding 75 tonnes per day, or where the kiln capacity exceeds 4m3 and where the setting density of the kiln exceeds 300 kg/m3.
Firing heavy clay goods or refractory goods other than heavy clay goods in a kiln where the activity does not fall within a description in Part A of this Section.
Vapour glazing earthenware or clay with salts.
In this Part–
“clay” includes a blend of clay with ash, sand or other materials;
“refractory” means refractory material (such as fireclay, silica, magnesite, chrome-magnesite, sillimanite, sintered alumina, beryllia and boron nitride) which is able to withstand high temperatures and to function as a furnace lining or in other similar high temperature applications.