- Ranks of Coal as Classified by the American Society for Testing and Materials, Table
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▪ Tablecaloric value(moist, mineral-matter-free-basis)*fixed carbon percentage volatile matter percentage British thermal megajoulesrank and group equal to or less than equal to or equal to or less than equal to or less than agglomeratinggreater than greater than less than greater than greater than characterMeta-anthracite 98 . . . . . . 2 . . . . . . . . . . . . nonagglomeratingAnthracite 92 98 2 8 . . . . . . . . . . . .Semianthracite** 86 92 8 14 . . . . . . . . . . . .Low-volatile bituminous 78 86 14 22 . . . . . . . . . . . .Medium-volatile bituminous 69 78 22 31 . . . . . . . . . . . . commonlyHigh-volatile A bituminous . . . 69 31 . . . 14,000 . . . 32.6 . . . agglomerating****High-volatile B bituminous . . . . . . . . . . . . 13,000 14,000 30.2 32.6High-volatile C bituminous . . . . . . . . . . . . 11,500 13,000 26.7 30.210,500 11,500 24.4 26.7 agglomeratingSubbituminousSubbituminous A . . . . . . . . . . . . 10,500 11,500 24.4 26.7Subbituminous B . . . . . . . . . . . . 9,500 10,500 22.1 24.4Subbituminous C . . . . . . . . . . . . 8,300 9,500 19.3 22.1 nonagglomeratingLignite A . . . . . . . . . . . . 6,300 8,300 14.7 19.3Lignite B . . . . . . . . . . . . . . . 6,300 . . . 14.7*Moist coal contains natural inherent moisture but does not include visible water on the surface. **If agglomerating, classify in low-volatile group of the bituminous rank.***Coals having 69 percent or more fixed carbon on the dry, mineral-matter-free basis are classified by fixed carbon, regardless of calorific value. ****There may benonagglomerating varieties in these groups of the bituminous rank; there are also notable exceptions in the high-volatile C bituminous group.
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