87. Smokeless Coal No5 manufactured by Coal Products Limited at Immingham Briquetting Works, Immingham, North East Lincolnshire which–
(a)comprise anthracite fines (as to approximately 60 to 80% of the total weight), petroleum coke (as to approximately 10 to 30% of the total weight), bituminous coal (as to approximately 0 to 17% of the total weight) and molasses/acid or an organic binder (as the remaining weight);
(b)were manufactured from those constituents by a process involving roll-pressing and heat treatment of up to 300°C;
(c)are either unmarked pillow-shaped briquettes or, pillow-shaped briquettes marked with a single indented line running longitudinally along each face, off-set from its counterpart by 10 millimetres;
(d)have an average weight of 55 or 80 grams per briquette; and
(e)have a sulphur content not exceeding 2% of the total weight.