non-combustible materials definition
non-combustible materials means a material which neither burns nor gives off inflamable vapours in sufficient quantity to ignite a pilot flame.
non-combustible materials means material which is deemed to be non-combustible when tested in accordance with the provisions of the current edition of British Standard 476: Part 4, or such other material or combination of materials as the Council accepts as being non- combustible for the purpose of these rules.