# The Smoke Control Areas (Authorised Fuels) (Wales) Regulations 2019, Paragraph 31

Extent: E+W

Dual briquettes manufactured by Coal Products Limited at Immingham Briquetting Works, Immingham, North East Lincolnshire which–
(a) comprise petroleum coke (as to approximately 55 to 80% of the total weight), anthracite (as to approximately 8 to 20% of the total weight), bituminous coal (as to approximately 8 to 20% of the total weight) and an organic binder (as the remaining weight);
(b) manufactured from those constituents by a process involving roll-pressing and cold cure;
(c) are unmarked square pillow-shaped briquettes;
(d) have an average weight of 100 grams per briquette; and
(e) have a sulphur content not exceeding 2% of the total weight.

---
Source: https://www.legislation.gov.uk/wsi/2019/50/schedule/paragraph/31 (the official version)
Page: https://openlegislation.uk/smoke-control-areas-authorised-fuels-wales-regulations-2019/schedule/paragraph-31
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.