User:Milton Beychok/Sandbox
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Class or Rank |
Group |
Fixed Carbon (wt % dry mmf) (b) |
Volatile Matter (wt % dry mmf) (b) |
Gross Heating Value (Btu/lb moist mmf) (c) | |||
---|---|---|---|---|---|---|---|
Equal or greater than |
Less than |
Greater than |
Equal or less than |
Equal or greater than |
Less than | ||
Anthracitic |
Metaanthracite (d) Anthracite (d) Semianthracite (d) |
98 92 86 |
98 92 |
2 8 |
2 8 14 |
||
Bituminous |
Low-volatile bituminous (d) Medium-volatile bituminous (d) High-volatile A bituminous High-volatile B bituminous High-volatile C bituminous High-volatile C bituminous |
78 69 |
86 78 69 |
14 22 31 |
22 31 |
14,000 13,000 11,500 10,500 |
|
Subbituminous |
Subbituminous A Subbituminous B Subbituminous C |
10,500 9,500 8,300 |
11,500 10,500 9,500 | ||||
Lignite |
Lignite A Lignite B |
6,300 |
8,300 6,300 | ||||
(a) This classification does not inclued a few coals (referred to as unbanded coals) having unusual physical and chemical properties falling within the fixed carbon and heating value ranges of the high-volatile bituminous and subbituminous ranks. (b) Percentage by weight on a dry and mineral matter free basis (mmf). |