The highest rank of coal. It is a hard, brittle, and black lustrous coal, often referred to as hard coal, containing a high percentage of fixed carbon and a low percentage of volatile matter.
SIZE FIX CARBON % SULPHUR %
0 to 13 mm 88 / 85 / 80 0.3 / 0.8
5 to 15 mm 88 / 85 / 80 0.3 / 0.8
10 to 30 mm 90 / 86 / 83 0.3 / 0.8