22. Ecoal 50 briquettes, manufactured by Coal Products Limited at Immingham Briquetting Works, Immingham, North East Lincolnshire which—N.I.
(a)comprise anthracite fines (as to approximately 30 to 55% of the total weight), biomass (as to approximately 25 to 35% of the total weight), petroleum coke (as to approximately 10 to 40% of the total weight), bituminous coal (as to approximately 0 to 5% of the total weight) and natural organic 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 300oC in a controlled, reduced oxygen environment;
(c)are hexagonal-shaped briquettes with a single stripe on one side across the flats;
(d)have an average weight of 135 g per briquette; and
(e)have a sulphur content not exceeding 2% of the total weight.