caloric value

(moist, mineral-matter-free-basis)*

fixed carbon percentage volatile matter percentage British thermal megajoules

(dry, mineral-matter-free basis) (dry, mineral-matter-free basis) units per pound per kilogram

rank and group equal to or less than equal to or equal to or less than equal to or less than agglomerating

greater than greater than less than greater than greater than character

Anthracitic

Meta-anthracite 98 . . . . . . 2 . . . . . . . . . . . . nonagglomerating

Anthracite 92 98 2 8 . . . . . . . . . . . .

Semianthracite** 86 92 8 14 . . . . . . . . . . . .

Bituminous

Low-volatile bituminous 78 86 14 22 . . . . . . . . . . . .

Medium-volatile bituminous 69 78 22 31 . . . . . . . . . . . . commonly

High-volatile A bituminous . . . 69 31 . . . 14,000 . . . 32.6 . . . agglomerating****

High-volatile B bituminous . . . . . . . . . . . . 13,000 14,000 30.2 32.6

High-volatile C bituminous . . . . . . . . . . . . 11,500 13,000 26.7 30.2

10,500 11,500 24.4 26.7 agglomerating

Subbituminous

Subbituminous A . . . . . . . . . . . . 10,500 11,500 24.4 26.7

Subbituminous B . . . . . . . . . . . . 9,500 10,500 22.1 24.4

Subbituminous C . . . . . . . . . . . . 8,300 9,500 19.3 22.1 nonagglomerating

Lignitic

Lignite A . . . . . . . . . . . . 6,300 8,300 14.7 19.3

Lignite 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 be

nonagglomerating varieties in these groups of the bituminous rank; there are also notable exceptions in the high-volatile C bituminous group.