# The Smoke Control Areas (Authorised Fuels) Regulations 1991, Paragraph 15

Extent: E+W+S
Status: prospective

Phurnacite briquettes, manufactured by Coal Products Limited atImmingham BriquettingWorks, Immingham, Humberside, which—
(a) comprise anthracite duff (as to approximately 85 per cent of thetotal weight) and molassesand phosphoric acid as binder (as to theremaining weight);
(b) were manufactured from those constituents by a process involvingroll-pressing and heattreatment at about 300°C;
(c) are ovoid-shaped briquettes with two parallel indented lines runninglongitudinally around the briquette and have an average weight of 40grammes; 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/15 (the official version)
Page: https://openlegislation.uk/smoke-control-areas-authorised-fuels-regulations-1991/schedule-1/paragraph-15
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.