# The Smoke Control Areas (Authorised Fuels) (Scotland) Regulations 2001, Paragraph 18


Island Lump and Island Nuts, manufactured by Unocal Refinery, California, the United States of America, which–
(a) comprise petroleum coke;
(b) were manufactured from the petroleum coke by a process involving heat treatment and steam injection;
(c) are unmarked random shapes;
(d) have an average weight of 80 grammes (per briquette of Island Lump) or 30 grammes (per briquette of Island Nuts); and
(e) have a sulphur content not exceeding 2 per cent of the total weight.

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Source: https://www.legislation.gov.uk/ssi/2001/433/schedule/1/paragraph/18 (the official version)
Page: https://openlegislation.uk/smoke-control-areas-authorised-fuels-scotland-regulations-2001/schedule-1/paragraph-18
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.