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Classification of Coal by Rank (ASTM D388-12)

July.27 Coal

Classification of Coal by Rank (ASTM D388-12)
Coal Rank Fix Carbon Limits Volatile Content Gross Calorific Value Limits Agglomerating Characteristics
% % Btu/lb MJ/kg
dmmf dmmf Moisture mmf moisture mmf
Antracite Class Meta- Anthracite ≥98% <2%     Non-agglomerating
Anthracite 92 to 98% 2 to 8%    
Semi-Anthracite (Lean Coal) 86 to 92% 8 to 14%    
Bituminous Low Volatile Bituminous 78 to 86% 14 to 22%     Commonly agglomerating
Medium Volatile Bituminous 69 to 78% 22 to 31%    
High Volatile A Bituminous <69% >31% ≥14,000 ≥32.557
High Volatile B Bituminous <69% >31% 13,000 to 14,000 30.232 to 32.557
High Volatile C Bituminous <69% >31% 11,500 to 13,000 26.743 to 30.232
High Volatile C Bituminous   >31% 10,500 to 11,500 24.418 to 26.743 Agglomerating
Subbituminous Subbituminous A coal     10,500 to 11,500 24.418 to 26.743 Non-agglomerating
Subbituminous B coal     9,500 to 10,500 22.09 to 24.418
Subbituminous C coal     8,300 to 9,500 19.30 to 22.09
Lignite Lignite A     6,300 to 8,300 14.65 to 19.30 Non-agglomerating
Lignite B     <6,300 <14.65
         
Note : Calculating sulfur trioxide that is determined in accordance with ASTM D5016-08, dmmf:dry mineral-matter-free basis , moisture mmf : moisture mineral-matter free basis