# The Smoke Control Areas (Authorised Fuels) Regulations 1991, Paragraph 5

Extent: E+W+S
Status: prospective

Centurion briquettes, manufactured by Greystone Heating MarketingLimited at Hamilton, Lanarkshire, which—
(a) comprise anthracite (as to approximately 90 per cent of the totalweight) and molasses and phosphoric acid as binder (as to the remainingweight);
(b) were manufactured from those constituents by a process involvingroll-pressing and heat treatment at about 250°C;
(c) are unmarked ovoids and have an average weight of 35 grammes; and
(d) have a sulphur content not exceeding 1.5 per cent of the totalweight.

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Source: https://www.legislation.gov.uk/uksi/1991/1282/schedule/1/paragraph/5 (the official version)
Page: https://openlegislation.uk/smoke-control-areas-authorised-fuels-regulations-1991/schedule-1/paragraph-5
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.