# The Smoke Control Areas (Authorised Fuels) Regulations 1991, Paragraph 20

Extent: E+W+S
Status: prospective

Thermobrite briquettes and Thermaglow briquettes, manufactured byVolkseigener Betrieb Gaskombinat“Fritz Selbmann” Schwarze Pumpe at Lauchhammer, Germany, which—
(a) comprise milled lignite;
(b) were manufactured from the lignite by a process involving extrusion,drying and heat treatment at a temperature greater than 900°C;
(c) are unmarked briquettes which are produced in three sizes:Thermobrite or Thermaglow Large, Thermobrite or Thermaglow Doubles andThermobrite or Thermaglow Beans; and
(d) have a sulphur content not exceeding 2 per cent of the total weight.

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Source: https://www.legislation.gov.uk/uksi/1991/1282/schedule/1/paragraph/20 (the official version)
Page: https://openlegislation.uk/smoke-control-areas-authorised-fuels-regulations-1991/schedule-1/paragraph-20
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.