Schedule 1, Part 2, Chapter 3, 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: legislation.gov.uk · retrieved 2026-07-30