# The Smoke Control Areas (Authorised Fuels) (Wales) Regulations 2019, Paragraph 61

Extent: E+W

Hot Rocks, manufactured by EU Zeme Limited at Riga, Eksporta Street 15, LV-1045, Latvia, which—
(a) comprise crushed anthracite (as to approximately 73% of the total weight), bituminous coal (as to approximately 18% of the total weight) and a molasses and orthophosphoric acid binder (as to the remaining weight);
(b) were manufactured from those constituents by a process involving roll-pressing followed by heat treatment at a temperature of approximately 250 to 280°C;
(c) are almost round pillow-shaped briquettes that are 40 millimetres in diameter and about 21 millimetres thick at the centre of the briquette;
(d) have an average weight of 23 grams; and
(e) have a sulphur content not exceeding 0.5% of the total weight.

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Source: https://www.legislation.gov.uk/wsi/2019/50/schedule/paragraph/61 (the official version)
Page: https://openlegislation.uk/smoke-control-areas-authorised-fuels-wales-regulations-2019/schedule/paragraph-61
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.