# The Smoke Control Areas (Authorised Fuels) Regulations 1988, Paragraph 3


Thermaglow briquettes manufactured by Volks Eigenes Betrieb Gaskombinat “Fritz Selbmann” at Lauchhammer, German Democratic Republic which —
(a) are composed of milled lignite converted into briquettes by an extrusion process, after which they are dried and heated in the absence of air to about 1000°C;
(b) are unmarked briquettes approximately 20 mm × 90 mm × 60 mm with rounded corners and a bulk density of 540 kilogrammes per cubic metre; and
(c) have a sulphur content not exceeding 2 per cent of total weight.

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Source: https://www.legislation.gov.uk/uksi/1988/1607/schedule/paragraph/3 (the official version)
Page: https://openlegislation.uk/smoke-control-areas-authorised-fuels-regulations-1988/schedule/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.