Older geologic age than subbituminous coal, with higher heating value, lower sulfur, typically higher volatile matter and ash than subbituminous coal. Used for both steam and electricity production, as well as for production of steel. Metallurgical coal is typically bituminous coal, with a free swelling index of over 4.5 and with “dial divisions per minute” (a measure of “fluidity”) of over 1,500 and sometimes over 20,000. Heating value of bituminous coal typically ranges from 10,000 to 13,000 Btu/lb.
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