# The Smoke Control Areas (Authorised Fuels) (Scotland) (No. 2) Regulations 2008, Paragraph 25

Extent: S

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/2008/295/schedule/paragraph/25 (the official version)
Page: https://openlegislation.uk/smoke-control-areas-authorised-fuels-scotland-no-2-regulations-2008/schedule/paragraph-25
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.