Paragraph 8 I1

comprise 10 to 15 per cent bituminous coal, 10 to 15 per cent petroleum coke, 70 to 80 per cent anthracite duff and starch binder (as to the remaining weight);

were manufactured from those constituents by a process involving roll pressing and heat treatment at about 260°C;

are unmarked pillow shaped briquettes;

have an average weight of 140 grammes per briquette; and

have a sulphur content not exceeding 1.9 per cent sulphur on a dry basis.