# The Smoke Control Areas (Authorised Fuels) (Wales) Regulations 2008, Paragraph 29


Multiheat briquettes, manufactured by Coal Products Limited at Immingham Briquetting Works, Immingham, North East Lincolnshire, which—
(a) comprise anthracite (as to approximately 60 to 80 per cent of the total weight), petroleum coke (as to approximately 10 to 30 per cent of the total weight) and a molasses and phosphoric acid binder (as to the remaining weight);
(b) were manufactured from those constituents by a process involving roll-pressing and heat treatment at about 300°C;
(c) are unmarked pillow-shaped briquettes and have average weights per briquette of either 55 or 80 grammes; and
(d) have a sulphur content not exceeding 2 per cent of the total weight.

---
Source: https://www.legislation.gov.uk/wsi/2008/3100/schedule/paragraph/29 (the official version)
Page: https://openlegislation.uk/smoke-control-areas-authorised-fuels-wales-regulations-2008/schedule/paragraph-29
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.