comprise 10 to 15% bituminous coal, 10 to 15% petroleum coke, 70 to 80% 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 with approximate maximum dimensions of 67.6mm, 62.6mm, and 37.5mm;

have an average weight of 110g per briquette; and

have a sulphur content not exceeding 1.9% sulphur on a dry basis.