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(a)Firing heavy clay goods or refractory goods in a kiln where a reducing atmosphere is essential or with a production capacity exceeding 50 tonnes per day.
(b)Vapour glazing earthenware or clay with salts.
Firing heavy clay goods or refractory material (other than heavy clay goods) in a kiln where the process does not fall within a description in Part B of this Section.
In this Section, “clay” includes a blend of clay with ash, sand or other materials;
“refractory material” means 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.
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