User:Milton Beychok/Sandbox

Classification of Coals by Rank

Class or Rank	Group	Fixed Carbon (% dry mmf)		Volatile Matter (% dry mmf)		Gross Heating Value (Btu/lb moist mmf)
		Equal or greater than	Less than	Greater than	Equal or less than	Equal or greater than	Less than
Anthracitic	Metanthracite Anthracite Semianthracite	98 92 86	98 92	2 8	2 8 14
Bituminous	Low-volatile bituminous Medium-volatile bituminous 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	14,000 13,000 11,500
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
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