# The Environmental Permitting (England and Wales) Regulations 2016, Paragraph 1


In Part B—
“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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Source: https://www.legislation.gov.uk/uksi/2016/1154/schedule/1/part/2/chapter/3/crossheading/ceramic-production/paragraph/1 (the official version)
Page: https://openlegislation.uk/environmental-permitting-england-and-wales-regulations-2016/schedule-1/part-2/chapter-3/crossheading-ceramic-production/paragraph-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.